Don’t Skip These 2 KEY Vitamins When Taking Vitamin D

Updated: October 5, 2023

Vitamin d breakfast

Reviewed By:
Lara Pizzorno – AlgaeCal Scientific Advisory Board Member
MDiv, MA, LMT
Best-selling author of Healthy Bones Healthy You! and Your Bones; Editor of Longevity Medicine Review, and Senior Medical Editor for Integrative Medicine Advisors.

Did you know that taking vitamin D without adequate levels of vitamins A and K could actually damage your health? 

For years now, we’ve been hearing about the importance of vitamin D, but what no one seems to be talking about is the fact that your body requires a delicate balance of vitamin D with other fat-soluble vitamins.

While it’s true that there are alarming nationwide deficiencies in vitamin D, taking large doses of this nutrient alone could actually do more harm than good [1][2].

Continue reading as we unveil the hidden connections between Vitamin D, Vitamin A, and Vitamin K. Delve into their synergistic balancing act and discover why harnessing the power of all three could be the key to unlocking your true vitality and unleashing the perfect balance of health within you.

The Relationship Between Vitamins A, D, and K

Fat-soluble vitamins are a group of nutrients that work together and are particularly vital for healthy bones. When one vitamin is low, it can throw the others off balance. Similarly, when you have an excess of one, it can also create harmful effects like increasing the risk of fractures.

Let’s take a closer look at the relationship between vitamin D and two other fat-soluble vitamins; vitamin A and vitamin K.

Vitamin a, d and k in foods

Vitamin D and Vitamin A

Much like vitamin D, it appears that in the U.S., around 45% of the population is consuming inadequate levels of vitamin A [3]. This means that two nutrients vital for bone health are missing from most people’s nutritional intake. 

Now let’s take a look at how these two fat-soluble vitamins work together.

Vitamin A and vitamin D  bind to and activate specific receptors and these receptors can team up, joining together to form a two-part complex called a heterodimer. Together, this vitamin A and vitamin D heterodimer triggers the activation of thousands of genes whose responses promote healthy physiological function. What this means is that both vitamin A and vitamin D need to be present to support optimal health. The more vitamin D you take, the more vitamin A you’ll need. 

This is particularly important when it comes to bone health. Studies show that adequate vitamin A intake results in higher bone mineral density – but only if you also have adequate vitamin D [4][5].

What exactly is the bone health connection?

Vitamin D is responsible for delivering calcium to your bones and promotes the production of osteocalcin – a bone-building protein. Research suggests that the combination of vitamin D and vitamin A boosts osteocalcin production by allowing the vitamin D receptor to bind more strongly, increasing osteocalcin gene expression [6]. By optimizing the activity of vitamin D, Vitamin A improves calcium uptake in your bones and therefore assists in improving bone mineral density [7].

Now, you may have heard that taking vitamin A is actually bad for bone health – so what gives?

Studies show that very high doses of vitamin A may, in fact, increase your risk for fracture. However, this is only true in the presence of low vitamin D. In other words, vitamin A is only a threat to bone health if your vitamin D levels are low [8][9]. 

Ultimately, this further underlines the need for maintaining a healthy balance of these two vitamins, and remembering to add vitamin A when you start supplementing with vitamin D.

But why are we all lacking vitamin A in the first place?

The best sources of vitamin A come from foods like liver, fish, eggs, and dairy. These foods contain preformed vitamin A (vitamin A in its natural state), as opposed to carotenoids, which need to be converted to vitamin A. While carotenoids are abundant in many people’s diets in the form of foods like leafy greens, tomatoes, red bell peppers, and carrots, they don’t give you as much bang for your buck in the vitamin A department compared to preformed vitamin A in dairy, liver, eggs, and fish.

The problem is that the bioavailability of carotenoids can vary significantly depending on the food matrix itself and your personal ability to digest and absorb them. In fact, research shows that the absorption of beta-carotene from plant sources ranges from 5% to 65% in humans [10]. 

On top of this, the small fraction of beta-carotene that ends up being absorbed then needs to be converted into usable vitamin A, with the help of an enzyme. For many of us, this conversion is highly inefficient due to genetic variations called single nucleotide polymorphisms (SNPs). Three specific SNPs have been found to reduce activity of the conversion enzyme by a whopping 59%, 51%, and 48%. And research shows that the frequency of these SNPs varies from 43-84%, 52-100%, and 19-67% across 11 different ethnic population groups (including those of Northern and Western European ancestry) [11]!    

Therefore, your vitamin A needs are likely higher than you may think for two reasons:

  1. Dietary sources of vitamin A won’t necessarily convert well, unless you’re consuming plenty of preformed vitamin A.
  2. If you’re supplementing with vitamin D, you’ll need to increase vitamin A accordingly to ensure a proper balance of these two nutrients.
leafy greens vitamin d and vitamin k

Vitamin D and Vitamin K

Vitamin D and vitamin K are another set of nutrients that have a synergistic relationship, with both vitamins profoundly impacting bone health. 

While vitamin D helps with calcium absorption from your intestines, vitamin K assists in directing calcium into the tissues where it’s most needed. Specifically, vitamin K2 plays a crucial role in activating the enzymes that direct calcium into your bones (and keep calcium from depositing in your arteries). 

Both of these vitamins also play a role in the function of osteocalcin (the bone-growth protein mentioned previously). While the production of osteocalcin requires vitamin D, in order for this protein to carry out its function of pulling calcium into your bones, it needs to be activated by vitamin K. 

Furthermore, when vitamin K levels are low, the calcium that’s meant for your bones is free to be deposited into your soft tissue – which is the opposite of what you want [12]. 

Therefore, you need a healthy balance of both vitamin K and vitamin D for optimal osteocalcin production and utilization. 

So, what happens when you don’t have enough of one of these vitamins? Studies suggest that taking high doses of vitamin D could promote the production of large amounts of vitamin K-dependent proteins, such as osteocalcin, which remain inactive due to inadequate vitamin K. This leaves the vitamin K-dependent proteins unable to carry out their proper functions, which include bone mineralization and the inhibition of soft tissue calcification [13]. 

Again, the moral of the story here is that as you increase your vitamin D supplementation, you need to be sure that you’re getting enough vitamin K to balance out all of vitamin D’s activities.

Takeaway

It’s fair to say that most people could benefit from taking a vitamin D supplement due to this nutrient’s widespread deficiency. However, taking vitamin D without considering your needs for vitamin A and vitamin K could actually be detrimental to your health. 

Too much vitamin A without enough vitamin D, for example, could promote bone loss and put your bones at risk for fracture. Furthermore, too much vitamin D, without enough vitamin K, could increase your risk for calcium ending up where you don’t want it, forming kidney stones or calcifying your arteries, instead of getting into your bones. 

Other systems in your body may also be impacted by an imbalance in these nutrients, like your cardiovascular system, which requires adequate vitamin K to shuttle calcium away from your soft tissues, preventing arterial calcification. 

At the end of the day, while we may still be on a continuous journey to learn about the complexities of the human body, one thing we know for certain is that balance is always key.

To learn more about bone health and healthy aging, sign up for the AlgaeCal Newsletter and stay in the loop with the latest research and news.

FAQs

Do vitamins A and D work together?

Vitamin A enhances the activity of vitamin D. Furthermore, the potentially harmful effects of vitamin A on bone health are only present when vitamin D is deficient due to the synergistic quality of the relationship between these two nutrients.

Should vitamin D and K be taken together?

Vitamin D and vitamin K should always be taken together as these two nutrients work as a team to promote both bone and cardiovascular health.

What are vitamins A, D, and K good for?

Vitamins A, D, and K are all fat-soluble vitamins that work together to promote bone health, calcium homeostasis, and cardiovascular health.

Is it safe to take fat-soluble vitamins daily?

Fat-soluble vitamins are okay to take daily as long as you’re getting the appropriate amount of each in a balanced ratio and are not over-supplementing.

What are fat-soluble vitamins good for?

Fat-soluble vitamins have a wide range of activities in the human body, including roles in bone health, heart health, immunity, growth and development, vision, reproduction, and more.

References 

  1. https://ods.od.nih.gov/factsheets/VitaminD-HealthProfessional/#h6
  2. Cui, A., Zhang, T., Xiao, P., Fan, Z., Wang, H., & Zhuang, Y. (2023). Global and regional prevalence of vitamin D deficiency in population-based studies from 2000 to 2022: A pooled analysis of 7.9 million participants. Frontiers in Nutrition, 10.
  3. Reider, C. A., Chung, R. Y., Devarshi, P. P., Grant, R. W., & Hazels Mitmesser, S. (2020). Inadequacy of immune health nutrients: intakes in US adults, the 2005–2016 NHANES. Nutrients, 12(6), 1735.
  4. Joo, N. S., Yang, S. W., Song, B. C., & Yeum, K. J. (2015). Vitamin A intake, serum vitamin D and bone mineral density: Analysis of the Korea National Health and Nutrition Examination Survey (KNHANES, 2008–2011). Nutrients, 7(3), 1716-1727.
  5. Chen, G. D., Zhu, Y. Y., Cao, Y., Liu, J., Shi, W. Q., Liu, Z. M., & Chen, Y. M. (2015). Association of dietary consumption and serum levels of vitamin A and β-carotene with bone mineral density in Chinese adults. Bone, 79, 110-115.
  6. Schräder, M., Bendik, I., Becker-Andre, M., & Carlberg, C. (1993). Interaction between retinoic acid and vitamin D signaling pathways. Journal of Biological Chemistry, 268(24), 17830-17836.
  7. Sirajudeen, S., Shah, I., & Al Menhali, A. (2019). A narrative role of vitamin D and its receptor: with current evidence on the gastric tissues. International journal of molecular sciences, 20(15), 3832.
  8. Yee, M. M. F., Chin, K. Y., Ima-Nirwana, S., & Wong, S. K. (2021). Vitamin A and bone health: a review on current evidence. Molecules, 26(6), 1757.
  9. Caire-Juvera, G., Ritenbaugh, C., Wactawski-Wende, J., Snetselaar, L. G., & Chen, Z. (2009). Vitamin A and retinol intakes and the risk of fractures among participants of the Women’s Health Initiative Observational Study. The American journal of clinical nutrition, 89(1), 323-330.
  10. Haskell, M. J. (2012). The challenge to reach nutritional adequacy for vitamin A: β-carotene bioavailability and conversion—evidence in humans. The American journal of clinical nutrition, 96(5), 1193S-1203S.
  11. Lietz, G., Oxley, A., Leung, W., & Hesketh, J. (2012). Single nucleotide polymorphisms upstream from the β-carotene 15, 15′-monoxygenase gene influence provitamin A conversion efficiency in female volunteers. The Journal of nutrition, 142(1), 161S-165S.
  12. Guney, G., Sener-Simsek, B., Tokmak, A., Yucel, A., Buyukkagnici, U., Yilmaz, N., … & Ozgu-Erdinc, A. S. (2019). Assessment of the relationship between serum vitamin D and osteocalcin levels with metabolic syndrome in non-osteoporotic postmenopausal women. Geburtshilfe und Frauenheilkunde, 79(03), 293-299.
  13. Van Ballegooijen, A. J., Pilz, S., Tomaschitz, A., Grübler, M. R., & Verheyen, N. (2017). The synergistic interplay between vitamins D and K for bone and cardiovascular health: a narrative review. International journal of endocrinology, 2017.

Article Comments

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  1. Sherri Wilt

    August 9, 2023 , 6:30 am

    So do we need to take supplements A and K above what is in 4 AlgaeCal pills? i take 2 in morning and 2 at lunch or dinner.

  2. Manja AlgaeCal

    August 9, 2023 , 12:25 pm

    Great question, Sherri! Since AlgaeCal contains no added vitamin A, you’re welcome to take extra. Vitamin D and Vitamin A work together and their intake should be comparable. For example, if you are consuming 2,000 IU of D3 daily (14,000 IU per week) than you should be getting approximately the same amount of vitamin A daily/weekly. Since it is a fat soluble vitamin, you do not need to take it every day.

    With regard to vitamin K, the amount in AlgaeCal Plus (100 mcg) is sufficient if you’re taking up to 5,000 IU of D3. Otherwise, if you are consuming more than 5,000 IU of D3 daily, your need for vitamin K2 will also increase to 200 mcg/day.

    I hope this helps but you can always call 1-800-820-0184 (USA & Canada toll-free) for more personalised support.

    – Manja

  3. Shayne Pedercini

    August 13, 2023 , 4:24 am

    The AlgaeCal pill doesn’t even have A in it? i am confused, so if you get the bone builder pack you still need to add more Vitamins on top of the bone builder system? that can get costly

  4. Shelby AlgaeCal

    August 14, 2023 , 3:11 pm

    Thank you for following up, Shayne! This is a great question, and I’d love to clarify this for you.

    While AlgaeCal supplements do not contain Vitamin A, our Bone Builder Pack is clinically supported to increase bone mineral density on its own! Beyond our studies, we have community members share with us every day that they have seen results on the AlgaeCal program. While supplementing with Vitamin A or other fat-soluble vitamins may have various benefits, it’s not absolutely essential if your goal is to increase your bone density. I hope this helps, and if you have any further questions, please feel free to contact us over the phone at 1-800-820-0184 (USA & Canada toll-free) for more detailed support. 🙂
    – Shelby

  5. Kathleen Wildrick

    August 9, 2023 , 6:34 am

    Doesn’t AlgaeCal Pius provide the necessary amount and balance of these vitamins?

  6. Sonia Griffiths

    August 9, 2023 , 10:26 am

    DoesAlgaecal provides these nutrients

  7. Yoori AlgaeCal

    August 9, 2023 , 3:15 pm

    Great question, Sonia! AlgaeCal Plus contains vitamin D3 and vitamin K2, but not vitamin A. In detail, AlgaeCal Plus provides 1600 IU of vitamin D3 per daily dose. This may be enough if your vitamin D3 level is within the optimal range, which research suggests is around 50-80 ng/mL (125-200 nmol/L). If you’re below this range, we recommend taking an extra, the amount depending on your blood level (please discuss this with your doctor). With regard to vitamin K, the amount in AlgaeCal Plus (100 mcg) is sufficient if you’re taking up to 5,000 IU of D3. Otherwise, if you are consuming more than 5,000 IU of D3 daily, your need for vitamin K2 will also increase to 200 mcg/day.

    Since AlgaeCal Plus does not have vitamin A included, please feel free to add in vitamin A to your regime. Vitamin D and Vitamin A work together and their intake should be comparable. For example, if you are consuming 2,000 IU of D3 daily (14,000 IU per week), then you should be getting approximately the same amount of vitamin A daily/weekly. Since it is a fat soluble vitamin, you do not need to take it every day.

    I hope this helps, Sonia! 🙂 Please let us know if you have additional questions.

    – Yoori

  8. Va. Petrea

    January 6, 2024 , 7:00 pm

    If I take AlgaeCal, will I be getting enough Vit. D, A & K. & Calcium daily? I was recently diagnosed with Osteoporosis & would like to not have to take so many pills per day. My Dr. wanted to put me on injections every six mos, but I do not want the side effects.

  9. Yoori AlgaeCal

    January 8, 2024 , 6:23 pm

    Thank you for sharing your story! My understanding is that calcium requirements are 1000mg per day if you’re in between the age of 19-50, 1200mg if you’re 51+ for women. AlgaeCal is very intentionally designed with 720mg of calcium in your daily dose and that’s because we take into consideration that the average dietary intake of calcium is 400-500mg of calcium daily, so that plus AlgaeCal Plus is approximately 1200mg per day – and it’s all coming from whole food, body friendly sources! 

    On the other hand, the amount of vitamin D you need depends on your blood level. As such, those individuals who have low vitamin D blood level may benefit from additional supplementation. If you haven’t already, we highly suggest testing your current vitamin D blood levels to assess your Vitamin D3 needs :). You can ask your doctor to order you a vitamin D blood test.

    As for vitamin K, AlgaeCal Plus contains 100 mcg per daily dosage of 4 capsules. The amount is generally sufficient for most people, but it may vary slightly if you are taking larger amounts of Vitamin D3, so this is something to consider!

    Since AlgaeCal contains no added vitamin A, you’re welcome to take extra. Vitamin D and vitamin A work together and their intake should be comparable. For example, if you are consuming 2,000 IU of D3 daily (14,000 IU per week) than you should be getting approximately the same amount of vitamin A daily/weekly. Since it is a fat soluble vitamin, you do not need to take it every day.

    I hope this helps! Of course, please do let us know if you have any additional questions! We are happy to help!

    – Yoori

  10. Doris

    August 9, 2023 , 6:36 am

    Interesting article! Information that I didn’t know but you didn’t mention how much vitamin D, A and K a person should take daily for optimum results.

  11. Manja AlgaeCal

    August 9, 2023 , 10:00 am

    Great question, Doris! Vitamin D3 supplementation requirements vary from person to person depending on the amount of vitamin D in your blood. To determine the most accurate amount of Vitamin D3 levels in your body, it is strongly recommended to perform a vitamin D 25(OH)D blood test. With this information, you will be able to make an informed decision with your doctor for how much YOU need to supplement to get into a healthy range. You can read more on this in our Vitamin D guide here.

    Vitamin D and Vitamin A work together and their intake should be comparable. For example, if you are consuming 2,000 IU of D3 daily (14,000 IU per week) than you should be getting approximately the same amount of vitamin A daily/weekly.

    Finally, the vast majority of us (85-95%) will find vitamin K2 in its MK-7 form at a dose of 100 – 180 micrograms per day is adequate. However, if you are taking a high dosage of D3 (above 5000 IU) then an additional 100mcg K2 would be suitable.

    I hope this helps! Should you have any questions, don’t hesitate!

    – Manja

  12. Patricia Monhollon

    August 9, 2023 , 2:06 pm

    So, i was under the impression you’ve included all needed to rebuild your bones…why was Vitamin A NOT INCLUDED if it’s a MUST to rebuild your bones AND works in the reverse if it is NOT included. It sounds like your formula without the Vitamin A actually takes calcium out of your bones. That sounds dangerous to me.

  13. Yoori AlgaeCal

    August 9, 2023 , 3:59 pm

    Thank you for sharing your concern, Patricia! I’d be happy to address this for you!

    Patricia, our current formulation of AlgaeCal Plus is clinically supported to increase bone mineral density. While adding vitamin A to our formulation may give an additional benefit for an optimal result, it is not absolutely necessary – and we know this because our current formulation is working wonders!

    Rest assured, vitamin D3 and K2 added to our AlgaeCal Plus works hand-in-hand to deliver calcium directly to your bones. Vitamin D3 helps absorb calcium into your bloodstream, then vitamin K2 directs the calcium from your blood into your bones. For your peace of mind, the AlgaeCal program has been studied for safety and efficacy. The most recently published study examines the effect of AlgaeCal Plus and Strontium Boost on adult bone density and health after 7 years. Not only did people taking AlgaeCal Plus and Strontium Boost for 7 years see a progressive linear increase in bone density, year after year – they also experienced no adverse side effects. This study can be found HERE.

    I hope this helps, Patricia :). Of course, please let us know if you have further questions!

    – Yoori

  14. Julie Kogan-White

    January 6, 2024 , 6:16 am

    I completely agree with Patricia’s concerns. And if this is in fact true that your bone building formulas actually
    take Calcium out of the bones without adding more K, then it would be highly negligent on the part of the company, and appear that the company is merely finding a way to make more money off of it’s customers, which I’d like to believe is not the company’s intent.

    I hope someone responds to her email, and mine as well. I have purchased and am currently using Algae Cal plus and Strontium and want to have faith in your company to continue using these products. Integrity is crucial.

  15. Yoori AlgaeCal

    January 8, 2024 , 5:45 pm

    Thank you for expressing your concerns, Julie. Of course, we take customer feedback seriously, and your satisfaction is of utmost importance to us.

    Julie, rest assured, our current formulation of AlgaeCal does not take calcium out of our bones. AlgaeCal is clinically supported to increase bone mineral density, and alongside our Strontium Boost, is all you need to see improvements in your bone health! Of course, nutrient needs depend on the individuals and there are many other vitamins or natural supplements that can have a positive benefit on bone health, however it was important to use to create a simple formulation that worked to achieve bone density increases. The effectiveness of AlgaeCal in this regard has been demonstrated in multiple clinical studies and, of course, in the thousands of DEXA scans from our customers.

    A friendly note that our AlgaeCal Plus contains 1600IU of vitamin D3 and 100mcg of vitamin K2 to help direct calcium into our bones where you want them to be! One thing to note is that Vitamin D3 supplementation requirements vary from person to person, depending on the amount of vitamin D in your blood and health goals. We recommend discussing the optimal dose of vitamin D with your doctor, as we are not medical professionals. As for vitamin K, AlgaeCal Plus contains 100 mcg per daily dosage of 4 capsules. The amount is generally sufficient for most people, but it may vary slightly if you are taking larger amounts of Vitamin D3, so this is something to consider!

    I hope this helps! If you have any follow-up questions or concerns you’d like to share with us, please give us a call at 1-800-820-0184 (US & Canada Toll-free) or email [email protected]. We’d be happy to provide personalized support for you! 🙂

    – Yoori

  16. Jackie Sherman

    August 9, 2023 , 6:55 am

    I take 10,000 IU of Vit D 3 times a week along with algae cal which has k2. My vit D level is 81. How much A is needed. It would be nice I’d these were in the algae cal formula.

  17. Manja AlgaeCal

    August 9, 2023 , 8:58 am

    Hi Jackie, a daily dose of 4 capsules of AlgaeCal Plus contains 1600 IUs of Vitamin D3, and this amount is sufficient if your vitamin D3 blood level is within the optimal range of 50-80 ng/ml. If you decide to continue supplementing with the additional D3, Lara Pizzorno recommends aiming for approximately the same amount of vitamin A as vitamin D. Since Vitamin A is fat soluble, it doesn’t need to be taken daily. So if you are consuming 41,000 IUs of D3 weekly, than you should be getting approximately the same amount of vitamin A weekly.

    Keep in mind, since you are consuming more than 5000 IU of D3 daily, your need for vitamin K2 will also increase to 200 mcg/day. Since 4 AlgaeCal Plus capsules provide 100 mcg, you will need to supplement with an additional 100 mcg.

    Hope this helps, Jackie! Feel free to call our Bone Health Consultants at 1-800-820-0184 (USA & Canada toll-free) or email [email protected] for more personalised support.

    – Manja

  18. patricia lindgren

    August 9, 2023 , 7:10 am

    Thanks for this – as always so helpful but where do we get Vitamin K – other than of course from AlgaeCal 😉

  19. Manja AlgaeCal

    August 9, 2023 , 8:42 am

    Patricia, Vitamin K2 can be found in a variety of animal food sources, but very few contain enough of this nutrient to support bone health on their own. The richest source of vitamin K2 is natto – a Japanese food made from fermented soybeans. It contains a lot of vitamin K2, but it’s hard to come by in Western supermarkets, and it’s an acquired taste.
    For more information, visit our Vitamin K article here.
    Let us know if you have any further questions!

    – Manja

  20. Stephanie Menkhaus

    August 9, 2023 , 7:49 am

    This is very interesting but no where in the article does it mention what range or ratio to consider if supplemental vitamins A, D or K2 are being considered or how (the process) to determine what is right amount(s) or how one is to know? I would very much appreciate more information on this

  21. Manja AlgaeCal

    August 9, 2023 , 12:36 pm

    Thank you for your feedback, Stephanie, we’ll definitely consider this for future content!

    The requirements will vary from person to person depending on the amount of vitamin D in your blood. The best way to determine your vitamin D requirements is to have a blood test done. With this information, you will be able to make an informed decision with your doctor for how much YOU need to supplement to get into a healthy range. For more information on this, visit our vitamin D guide here.

    Vitamin A works together with vitamin D and their intake should be comparable. For example, if you are consuming 2,000 IU of D3 daily (14,000 IU per week) than you should be getting approximately the same amount of vitamin A daily/weekly.

    Finally, the vast majority of us (85-95%) will find vitamin K2 in its MK-7 form at a dose of 100 – 180 micrograms per day is adequate. However, if you are taking a high dosage of D3 (above 5,000 IU) then an additional 100mcg K2 would be suitable.

    I hope this helps! Should you have any questions, don’t hesitate!

    – Manja

  22. Mindy

    August 9, 2023 , 8:32 am

    It would be nice to know the actual balance of Vit D to A, for example, 1000 mg to 500 or whatever. The same for Vit K. This article is informative but not helpful.

    Am I getting a good balance in taking AlgeaCal?

  23. Manja AlgaeCal

    August 9, 2023 , 12:47 pm

    Thank you for your feedback, Mindy! We’ll definitely consider adding this information in our future content.

    A daily dose of 4 capsules of AlgaeCal Plus contains 1600 IUs of Vitamin D3, and this amount is sufficient if your vitamin D3 blood level is within the optimal range of 50-80 ng/ml. However, if your vitamin D3 blood tests determine that you have less than 50 ng/ml, then we highly recommend you take additional D3 until you reach the optimal range. You can read more about this in our Vitamin D guide here.

    AlgaeCal Plus provides the right balance of vitamin D and K, but if you are taking additional D3 (and consuming more than 5000 IU of D3 daily), your need for vitamin K2 will also increase to 200 mcg/day. Since 4 AlgaeCal Plus capsules provide 100 mcg, you will need to supplement with an additional 100 mcg.

    Finally, there’s no added vitamin A in AlgaeCal Plus, so you can certainly supplement. Lara Pizzorno explained that Vitamin D and Vitamin A work together and their intake should be comparable. For example, if you are consuming 1,600 IU of D3 daily (11,200 IU per week) than you should be getting approximately the same amount of vitamin A daily/weekly.

    I hope this helps, Mindy, but feel free to call our Bone Health Consultants at 1-800-820-0184 (USA & Canada toll-free) for more personalised support!

    – Manja

  24. Monica Moll

    August 9, 2023 , 9:09 am

    Thank you for the insight into fat loving vitamins

  25. Manja AlgaeCal

    August 9, 2023 , 12:48 pm

    Thank you for taking the time to write to us, Monica! We’re happy to hear you found our article interesting.
    – Manja

  26. Nancy Lee Campbell

    August 9, 2023 , 9:24 am

    I know the importance of Vitamin K…but…I am taking a blood thinner & my doctor who is into Integrative Medicine does not want me to take Vit. K. It is also recommended in other information on blood thinners, to not take Vit. K. I do use Vit. D in higher amounts, recommended by my doctor, & Vit. A, along with other vitamins & minerals. Plus I do eat dark leafy green vegetables which contain Vit. K. Would you please comment on the use of Vit. K and people who are on blood thinners. Thanks.

  27. Yoori AlgaeCal

    August 9, 2023 , 3:04 pm

    Thank you for reaching out, Nancy! My understanding is that while a certain class of blood thinning medication (vitamin K antagonists) should not be taken along with vitamin K, there are other types of blood thinning medications that do not interact with vitamin K. So you may find it helpful to discuss those options with your doctor and ask for his / her best advice :).

    I hope this helps! Should you have any questions, don’t hesitate!

    – Yoori

  28. Christine L Lawson

    August 9, 2023 , 10:25 am

    How do we know if we are getting enough Vit A amd K when we take Vit D? What is the dosage we need for each of these Vitamins?

  29. Manja AlgaeCal

    August 9, 2023 , 1:26 pm

    Hi Christine! Vitamin D and Vitamin A work together and their intake should be comparable. For example, if you are consuming 2,000 IU of D3 daily (14,000 IU per week) than you should be getting approximately the same amount of vitamin A daily/weekly.

    With regard to vitamin K, the vast majority of us will find vitamin K2 in its MK-7 form at a dose of 100 – 180 micrograms per day is adequate. However, if you are taking a high dosage of D3 (above 5000 IU) then an additional 100mcg K2 would be suitable.

    I hope this helps! Should you have any more questions, don’t hesitate!

    – Manja

  30. Joyce Newell

    August 9, 2023 , 10:59 am

    You fail to mention the correct amount of each vitamin that should be taken to be in correct balance.
    Without this info your article is not very useful

  31. Yoori AlgaeCal

    August 9, 2023 , 3:30 pm

    Thank you for your feedback, Joyce! I’m happy to help! The amount of vitamin D recommended will depend on your vitamin D blood level. The amount of vitamin K & vitamin A recommended will depend on the amount of vitamin D you’re taking!

    Vitamin D: To determine the most accurate amount of Vitamin D3 levels in your body, it is strongly recommended to perform a vitamin D blood test. With this information, you will be able to make an informed decision with your doctor for how much vitamin D supplement will be best for YOU. For more information, please visit our blog article HERE on vitamin D guide.

    Vitamin A: Our Bone Health Expert, Lara, suggests supplementing approximately the same amount of vitamin A as vitamin D. For example, if you are consuming 2,000 IU of D3 daily (14,000 IU per week), then you should be getting approximately the same amount of vitamin A daily/weekly.

    Vitamin K: If you’re taking less than 5000IU of vitamin D3 per day, 100mcg per day of vitamin K should be adequate. If you are taking a high dosage of D3 (above 5000 IU) then 200mcg of K2 would be suitable.

    I hope this helps! Feel free to give us a call at 1-800-820-0184 (US & Canada Toll-free) or email [email protected] if you have any follow-up questions! 🙂

    – Yoori

  32. Dana Neal

    August 9, 2023 , 11:06 am

    Thanks for this information. I just found out that my vitamin D level was too high at 150. My doctor told me to stop any supplements with vitamin D for two months and then recheck. I have been on AlgaeCal regime for two years or more and my bone density has improved. I hate to stop but not sure what to do.

  33. Megan @ AlgaeCal

    August 9, 2023 , 2:03 pm

    Sorry to hear that, Dana! We can certainly understand how disappointing this must be. Not to worry, though – we wouldn’t expect a short break from AlgaeCal to undo two years of progress! We don’t suggest going against Doctor’s orders, so in the meantime, you may find it helpful to supplement your diet with more calcium-rich foods! You can find some on our blog article HERE. Should you have any additional questions, don’t hesitate!
    – Megan

  34. Shawna Depew

    August 9, 2023 , 12:12 pm

    My last vit d level was 56.2. How much do I need for vitamin a and k?

  35. Megan @ AlgaeCal

    August 9, 2023 , 1:55 pm

    Thanks for reaching out, Shawna! Our Bone Health Expert Lara suggests supplementing approximately the same amount of Vitamin A as Vitamin D. For reference, AlgaeCal Plus provides 1,600 IU of Vitamin D3 per daily dosage and is a sufficient amount to take if your Vitamin D blood level is optimal, which would be 50-80 ng/ml. The best way to determine your Vitamin D requirements is to have your Vitamin D blood levels checked regularly. That said, if your blood level is optimal and AlgaeCal Plus provides enough Vitamin D3 for your individual requirements, you just need to balance a weekly total of 11,200 IU of D3 (1,600 x 7), so you could take approximately 10,000 IU of Vitamin A weekly. And this does not need to be taken every day, for reference, you could take 5,000 IU of Vitamin A twice a week.

    With regard to vitamin K, the vast majority of us will find that vitamin K2 in its MK-7 form at a dose of 100 – 180 micrograms per day is adequate. That said, if you are taking a high dosage of vitamin D3 (above 5000 IU), you may want to discuss taking more vitamin K2 with your doctor or nutritionist. If you have any further questions, please don’t hesitate to reach out!
    – Megan

  36. Monika Šlesingerová

    August 9, 2023 , 12:26 pm

    Thanks for the information about need of the A, D and K2 vitamns for healthy bones.
    But what is the appropriate ratio between them???
    E.g. if I take 5000IU of the D3 and 3×500 mcg of the K2 MK-7 and 3×100 mcg of MK4 how much of the A vitamin I correctly need to take with them according your knowledge?

    Kind regards from Prague, Czech Republic, EUrope

  37. Megan @ AlgaeCal

    August 9, 2023 , 1:50 pm

    Great question, Monika! Our Bone Health Expert Lara suggests supplementing approximately the same amount of Vitamin A as Vitamin D. For reference, AlgaeCal Plus provides 1,600 IU of Vitamin D3 per daily dosage and is a sufficient amount to take if your Vitamin D blood level is optimal, which would be 50-80 ng/ml. The best way to determine your Vitamin D requirements is to have your Vitamin D blood levels checked regularly. That said, if your blood level is optimal and AlgaeCal Plus provides enough Vitamin D3 for your individual requirements, you just need to balance a weekly total of 11,200 IU of D3 (1,600 x 7), so you could take approximately 10,000 IU of Vitamin A weekly. And this does not need to be taken every day, for reference, you could take 5,000 IU of Vitamin A twice a week. Hope this helps! 🙂
    – Megan

  38. Denise

    August 9, 2023 , 2:38 pm

    After reading your article about vitamins A D K, Do I need to take supplements of these vitamins in addition to algae cal plus and strontium!
    I’m a little confused!

  39. Yoori AlgaeCal

    August 9, 2023 , 4:10 pm

    Great question, Denise! I’m happy to clarify this for you :).

    Denise, as AlgaeCal does not have vitamin A included, please feel free to add it to your regime for additional benefits. Our Bone Health Expert, Lara, suggests supplementing approximately the same amount of vitamin A as vitamin D. For example, if you are consuming 2,000 IU of D3 daily (14,000 IU per week), then you should be getting approximately the same amount of vitamin A daily/weekly. Since it is a fat soluble vitamin, you do not need to take it every day.

    It’s possible you may need additional vitamin D3 for optimal bone health. You see, vitamin D3 supplementation requirements vary from person to person depending on the amount of vitamin D in your blood. We are aiming for an optimal blood level of Vitamin D3 between 50-80 ng/ml (125-200 nmol/L). If you are already within this range, then the 1600 IU in the AlgaeCal Plus formulation should help you to maintain this level. To determine the most accurate amount of Vitamin D3 levels in your body and how much of an extra you would need, it is strongly recommended to perform a blood test with a doctor.

    If you are taking additional D3, then your requirement for Vitamin K2 also increases. These two vitamins work hand in hand to deliver calcium directly to your bones. Vitamin D3 helps absorb calcium into your bloodstream, then vitamin K2 directs the calcium from your blood into your bones. If someone takes less than 5000IU of D3 (AlgaeCal Plus provides 1600 IU), then the 100mcg of K2 in AlgaeCal Plus should be sufficient. If someone takes more than 5000IU of D3, then 200 mcg of K2/MK-7 is suitable, so we recommend taking an additional 100mcg of K2 on top of AlgaeCal Plus.

    I hope this helps, Denise! Please let us know if you have any further questions :).

    – Yoori

  40. Judy Tatum

    August 9, 2023 , 3:36 pm

    So what is the ratio of vitamin A to D that we should be taking? Most vitamin D comes with K built in, so I’m assuming that ratio to already be correct.

  41. Regina Fawncyne Worley

    August 10, 2023 , 3:06 pm

    there is no mention of how much K and A a person should take. Only that with increased D, a person should increase K and A. And that is new information to me. Never have I heard that. I’ve had bone density issues for over 30 years and not one doc has told me to supplement D with K and A!
    I currently take 2000 D3 daily. I looked at my multi vitamin and see that it has 1,050 mcg of A and 20 mcg of K.
    Please advise me on what I need to add.
    Thanks.
    Fawncyne Worley

  42. Samantha AlgaeCal

    August 11, 2023 , 7:04 am

    I’d be happy to help with this, Regina! Our Bone Health Expert, Lara, suggests that you supplement vitamin A in approximately the same amount as vitamin D. For example, if you consume 2,000 IU of D3 daily (14,000 IU per week), then you should aim to get the same amount of vitamin A daily or weekly. Regarding vitamin K, if you are taking less than 5000 IU of vitamin D3 per day, 100mcg of vitamin K per day should suffice. However, if you are taking more than 5000 IU of vitamin D3, then 200mcg of K2 would be more appropriate. Please let us know if you have any further questions. 🙂

    – Sam

  43. Janice W Hansen

    August 12, 2023 , 8:33 am

    It would be helpful if you also gave the amounts of A and K2 needed. And if it’s so crucial, why isn’t A in Algaecal?

  44. Shelby AlgaeCal

    August 14, 2023 , 3:07 pm

    Thank you for reaching out and sharing your feedback, Janice – we’ll definitely consider adding this information to future content! To answer your question, our current formulation of AlgaeCal Plus is clinically supported to increase bone mineral density. While supplementing with vitamin A may give an additional benefit, it is not absolutely necessary for increasing bone mineral density – and we know this because our current formulation is working wonders! Of course, do let us know if you have any other questions!
    – Shelby

  45. Jackie Willich

    August 18, 2023 , 6:04 am

    How do I know how much Vit- D, K, and A to take daily?

  46. Samantha AlgaeCal

    August 18, 2023 , 7:21 am

    Great question, Jackie! To determine how much Vitamin D supplement you need, it is important to know your Vitamin D3 levels. A Vitamin D blood test is recommended for this purpose. Your doctor can then help you make an informed decision on the best supplement dosage for you. Our Bone Health Expert, Lara, suggests supplementing with approximately the same amount of Vitamin A as Vitamin D. For instance, if you consume 2,000 IU of D3 daily (14,000 IU per week), you should aim to get the same amount of Vitamin A daily/weekly. As for Vitamin K, if you take less than 5000 IU of Vitamin D3 per day, 100mcg per day of Vitamin K should suffice. However, if you take a high dosage of D3 (above 5000 IU), 200mcg of K2 would be more suitable. I hope this helps! 🙂
    – Sam

  47. Kathryn Jagger Mack

    August 22, 2023 , 3:57 am

    Thank you for this information.
    I am concerned about receiving enough vitamin A in my diet. Do we count on supplements for receiving the correct amount of vitamin A or is it absorbed better through the food we eat? Do you sell a vitamin A supplement that can be taken with Algae Cal Plus?
    Will AlgaeCal ever include vitamin A in the AlgaeCal plus product?

  48. Megan @ AlgaeCal

    August 22, 2023 , 11:52 am

    Thanks for reaching out, Kathryn! When it comes to vitamin A from the diet, some food sources include leafy greens, liver, fish, eggs and dairy products. While we don’t currently have a Vitamin A product, ensure that you’re signed up for our newsletter and follow us on social media for any future product launches! Hope this helps and let us know if you have any additional questions!
    – Megan

  49. Brucia Breda

    August 22, 2023 , 11:36 am

    Cannot find any recommendations for dosage amounts of vitamins A and K in relation to D. My dr put me on D and my blood levels are now adequate.

  50. Megan @ AlgaeCal

    August 22, 2023 , 2:24 pm

    Thanks for taking the time to comment, Brucia! Our Bone Health Expert, Lara, suggests supplementing with approximately the same amount of Vitamin A as Vitamin D. For instance, if you consume 2,000 IU of D3 daily (14,000 IU per week), you should aim to get the same amount of Vitamin A daily/weekly. As for Vitamin K, if you take less than 5000 IU of Vitamin D3 per day, 100mcg per day of Vitamin K should suffice. However, if you take a high dosage of D3 (above 5000 IU), 200mcg of K2 would be more suitable. I hope this helps! 🙂
    – Megan

  51. Judy

    August 22, 2023 , 12:04 pm

    This is a very informative article. However, what I’m missing is the formula of vitamin A,D and K for a woman in her 60s who has osteoporosis. It’s great to read all this information but you also need some place to start in application

  52. Megan @ AlgaeCal

    August 22, 2023 , 2:24 pm

    Thanks for taking the time to comment, Judy! Our Bone Health Expert, Lara, suggests supplementing with approximately the same amount of Vitamin A as Vitamin D. For instance, if you consume 2,000 IU of D3 daily (14,000 IU per week), you should aim to get the same amount of Vitamin A daily/weekly. As for Vitamin K, if you take less than 5000 IU of Vitamin D3 per day, 100mcg per day of Vitamin K should suffice. However, if you take a high dosage of D3 (above 5000 IU), 200mcg of K2 would be more suitable. I hope this helps! 🙂
    – Megan

  53. Maria S

    August 22, 2023 , 9:42 pm

    Excellent information regarding vitamin D, A, and K….unfortunately the doctors that supposedly are treating me for my osteoporosis don’t provide this information. I don’t think k that the healthcare knows or conducted further research into this, they just give medication that will end being harmful to the long term. I am so glad that I came across articles for Algae cal and I am ready to try it praying this will help my negative numbers. Thank You!

  54. Cheryl Haines

    August 25, 2023 , 7:23 am

    Re the question is it safe to take fat-soluble vitamins daily, the answer is it’s okay as long as you’re getting the appropriate amount of each in a balanced ratio and not over-supplementing. What exactly is the appropriate amount? How does one figure that out?

  55. Samantha AlgaeCal

    August 25, 2023 , 11:55 am

    Great question, Cheryl! The amount of vitamin D you need to take depends on your vitamin D3 levels. It’s best to get a vitamin D blood test from your doctor to find out. With this, your doctor can help you determine the best supplement dosage for you. Lara, our Bone Health Expert, recommends taking around the same amount of Vitamin A as Vitamin D. For example, if you take 2,000 IU of D3 daily (14,000 IU per week), you should aim to get the same amount of Vitamin A daily/weekly. If you take less than 5,000 IU of Vitamin D3 per day, 100mcg per day of Vitamin K should be enough. However, if you take a high dosage of D3 (above 5,000 IU), 200mcg of K2 would be more appropriate. I hope this information is helpful!
    – Sam

  56. Cindy

    August 25, 2023 , 10:40 am

    It would be nice if this article spoke to recommended doses of each vitamin in relation to the others. Or a ratio.
    I take my D3 along with K2 in the evening, but my A is included in my multivitamin which I take in the morning and midday. Do the D and A literally have to be taken together, or is within a 24-hour period sufficient?

  57. Samantha AlgaeCal

    August 25, 2023 , 12:47 pm

    Thank you for your feedback, Cindy – this is a great question! From my understanding, these vitamins can be taken at intervals and do not necessarily have to be taken daily, since they are fat soluble. I hope this information helps! 🙂
    – Sam

  58. Joyce Martin

    September 7, 2023 , 11:13 am

    I appreciate this information on the relationship of nutrients. Some kind of number ranges for A, D and K would be much more helpful though. Is that not possible at this stage of research? (I try hard to supplement without wasting money. I have my supplements, seven, on an Excel spreadsheet.)

  59. Yoori AlgaeCal

    September 7, 2023 , 4:26 pm

    We appreciate your feedback, Joyce! Vitamin D3 supplementation requirements vary from person to person depending on the amount of vitamin D in your blood. To determine the most accurate amount of Vitamin D3 levels in your body, it is strongly recommended to perform a vitamin D 25(OH)D blood test. With this information, you will be able to make an informed decision with your doctor for how much YOU need to supplement to get into a healthy range. You can read more on this in our Vitamin D guide here.

    Vitamin D and Vitamin A work together and their intake should be comparable. For example, if you are consuming 2,000 IU of D3 daily (14,000 IU per week) than you should be getting approximately the same amount of vitamin A daily/weekly.

    Finally, the vast majority of us (85-95%) will find vitamin K2 in its MK-7 form at a dose of 100 – 180 micrograms per day is adequate. However, if you are taking a high dosage of D3 (above 5000 IU) then an additional 100mcg K2 would be suitable.

    I hope this helps! Should you have any questions, don’t hesitate!

    – Yoori

  60. Craig

    November 15, 2023 , 5:59 am

    In your article, you never give a baseline for these three vitamins. Nor do you give a ratio of the vitamins to each other.

    What would a proper ratio be?

  61. Yoori AlgaeCal

    November 15, 2023 , 3:45 pm

    Thank you for your feedback, Craig! I’d be happy to address this for you!

    The requirements will vary from person to person depending on the amount of vitamin D in your blood. The best way to determine your vitamin D requirements is to have a blood test done. With this information, you will be able to make an informed decision with your doctor for how much YOU need to supplement to get into a healthy range. For more information on this, visit our vitamin D guide here.

    Vitamin A works together with vitamin D and their intake should be comparable. For example, if you are consuming 2,000 IU of D3 daily (14,000 IU per week) than you should be getting approximately the same amount of vitamin A daily/weekly.

    Finally, the vast majority of us (85-95%) will find vitamin K2 in its MK-7 form at a dose of 100 – 180 micrograms per day is adequate. However, if you are taking a high dosage of D3 (above 5,000 IU) then an additional 100mcg K2 would be suitable.

    I hope this helps! Should you have any questions, don’t hesitate!

    – Yoori

  62. Julie

    January 6, 2024 , 3:31 am

    Hi, What would be dietary recommendations for vitamin K2 please?

  63. Yoori AlgaeCal

    January 8, 2024 , 5:22 pm

    Great question, Julie! We have a list of richest food sources of vitamin K2 available in our blog article HERE. I hope this helps! 🙂

    – Yoori

  64. Sue Griffin

    January 6, 2024 , 6:32 am

    So how do we decide what to consume in vitamin supplements? How much of each and when?

  65. Yoori AlgaeCal

    January 8, 2024 , 6:03 pm

    Thank you for reaching out, Sue! As the amount of vitamin needs are individualized, we recommend consulting a healthcare professional on the optimal dosage that would be best for YOU!

    A good starting point would be to determine how much vitamin D you need! You can ask your doctor to order you a vitamin D blood test. If your test shows healthy levels of vitamin D, researchers suggest aiming for anywhere between 600-4000 IU of D3/day from all sources. If your test shows low levels of vitamin D, to achieve higher levels, our suggested approach is to take anywhere from 2000-5000 IU D3/day from all sources for 3-4 months and then retest your levels.

    Vitamin D and vitamin A work together and their intake should be comparable. For example, if you are consuming 2,000 IU of D3 daily (14,000 IU per week), then you should be getting approximately the same amount of vitamin A daily/weekly.

    Finally, the vast majority of us (85-95%) will find vitamin K2 in its MK-7 form at a dose of 100 – 180 micrograms per day is adequate. However, if you are taking a high dosage of D3 (above 5000 IU), then an additional 100mcg K2 would be suitable.

    Of course, we recommend confirming the optimal dose of these vitamins with your healthcare provider, as we are not medical professionals :). You are welcome to take these vitamins any time of the day, but they are best taken with a healthy source of fats such as avocado, olive oil, seeds, nuts, etc.

    – Yoori

  66. Bonnie

    January 6, 2024 , 7:04 am

    I am curious why AlgaeCal Plus does not contain Vitamin A since this article on your website indicates that is one of the keys to bone health (“Studies show that adequate vitamin A intake results in higher bone mineral density – but only if you also have adequate vitamin D”). You include D and K, why not A?

  67. Yoori AlgaeCal

    January 8, 2024 , 5:57 pm

    Great question, Bonnie! Our current formulation of AlgaeCal Plus is clinically supported to increase bone mineral density, and alongside our Strontium Boost, is all you need to see improvements in your bone health! There are many other vitamins or natural supplements that can have a positive benefit on bone health, however it was important to use to create a simple formulation that worked to achieve bone density increases.

    Therefore, while adding vitamin A to our formulation will give additional benefit, it is not absolutely necessary – and we know this because our current formulation is working wonders! If in case you’d like to add vitamin A to your regime for extra benefit, please feel free to do so! 🙂 A friendly note that Vitamin D and Vitamin A work together and their intake should be comparable. For example, if you are consuming 2,000 IU of D3 daily (14,000 IU per week), then you should be getting approximately the same amount of vitamin A daily/weekly. Since it is a fat soluble vitamin, you do not need to take it every day.

    I hope this helps! Do let us know if you have any follow-up questions! 🙂

    – Yoori

  68. Becky Hull

    January 6, 2024 , 12:09 pm

    why doesn’t algae cal plus have vitamin A in it, then? I would love to know your recommendation for getting the proper amount of vitamin a. I take Algae Plus and Strontium Boost daily.
    thank you!

  69. Yoori AlgaeCal

    January 8, 2024 , 6:04 pm

    Thank you for reaching out, Becky! Our current formulation of AlgaeCal Plus is clinically supported to increase bone mineral density, and alongside our Strontium Boost, is all you need to see improvements in your bone health! There are many other vitamins or natural supplements that can have a positive benefit on bone health, however it was important to use to create a simple formulation that worked to achieve bone density increases.

    Therefore, while adding vitamin A to our formulation will give additional benefit, it is not absolutely necessary – and we know this because our current formulation is working wonders! If you’d like to add vitamin A to your regime for extra benefit, keep in mind that vitamin D and vitamin A work together and their intake should be comparable. For example, if you are consuming 2,000 IU of D3 daily (14,000 IU per week), then you should be getting approximately the same amount of vitamin A daily/weekly. Since it is a fat soluble vitamin, you do not need to take it every day.

    I hope this helps! Do let us know if you have any follow-up questions! 🙂

    – Yoori

  70. Teresa Stryker

    January 6, 2024 , 4:02 pm

    Extremely useful BUT no quantity amounts are given in order to know how much of each vitamin should be taken in relation to the others. It ends up making us more anxious than informed.

  71. Yoori AlgaeCal

    January 8, 2024 , 6:15 pm

    We truly appreciate your feedback, Teresa, and I’m truly sorry for the inconvenience. I’m happy to help right away!

    Teresa, the amount of vitamin needs are individualized. A good starting point to determine how much each vitamin you need would be to test your vitamin D blood level! You can ask your doctor to order you a vitamin D blood test. If your test shows healthy levels of vitamin D, researchers suggest aiming for anywhere between 600-4000 IU of D3/day from all sources. If your test shows low levels of vitamin D, to achieve higher levels, our suggested approach is to take anywhere from 2000-5000 IU D3/day from all sources for 3-4 months and then retest your levels.

    Vitamin D and vitamin A work together and their intake should be comparable. For example, if you are consuming 2,000 IU of D3 daily (14,000 IU per week), then you should be getting approximately the same amount of vitamin A daily/weekly.

    Finally, the vast majority of us (85-95%) will find vitamin K2 in its MK-7 form at a dose of 100 – 180 micrograms per day is adequate. However, if you are taking a high dosage of D3 (above 5000 IU), then an additional 100mcg K2 would be suitable.

    Of course, we recommend confirming the optimal dose of these vitamins with your healthcare provider, as we are not medical professionals :). I hope this helps! Please don’t hesitate to reach out if you have additional questions!

    – Yoori

  72. Evelyn McKelvie

    January 7, 2024 , 8:23 am

    Why don’t you tell us what are the right levels of D, A, and K that enhance bone health???

  73. Yoori AlgaeCal

    January 8, 2024 , 5:54 pm

    Thank you for your feedback, Evelyn! The amount of vitamin D, A, and K you need really depends on the individual. You see, vitamin D3 supplementation requirements vary from person to person depending on the amount of vitamin D in your blood. To determine the most accurate amount of Vitamin D3 levels in your body, it is strongly recommended to perform a vitamin D 25(OH)D blood test. With this information, you will be able to make an informed decision with your doctor for how much YOU need to supplement to get into a healthy range. You can read more on this in our Vitamin D guide here.

    Vitamin D and Vitamin A work together and their intake should be comparable. For example, if you are consuming 2,000 IU of D3 daily (14,000 IU per week), then you should be getting approximately the same amount of vitamin A daily/weekly.

    Finally, the vast majority of us (85-95%) will find vitamin K2 in its MK-7 form at a dose of 100 – 180 micrograms per day is adequate. However, if you are taking a high dosage of D3 (above 5000 IU), then an additional 100mcg K2 would be suitable.

    Of course, we always recommend consulting a healthcare professional on the optimal dosage of vitamins that would work best for you! 🙂

    – Yoori

  74. Rosalind Simmons

    January 8, 2024 , 5:25 am

    I am already taking 4 tablets per day of Algae Cal Plus as well as 2 tablets per day of AlgaeCal Strontium Boost. Do I need to take additional vitamins/supplements. Thank you for your response.

  75. Yoori AlgaeCal

    January 8, 2024 , 5:51 pm

    Great question, Rosalind! If your goal is to increase bone density, AlgaeCal Plus and Strontium Boost are the ideal supplements for you. They are rich in all the essential nutrients that are required to promote healthy bone growth. The effectiveness of AlgaeCal in this regard has been demonstrated in multiple clinical studies and, of course, in the thousands of DEXA scans from our customers.

    However, it’s worth noting that the 1600 IU of vitamin D3 present in AlgaeCal Plus may not be sufficient to achieve optimal levels of vitamin D. As such, some individuals may benefit from additional supplementation of vitamin D. A good starting point would be to determine how much vitamin D you need! We highly suggest testing your current vitamin D blood levels to assess your Vitamin D3 needs :). You can ask your doctor to order you a vitamin D blood test.

    AlgaeCal Plus contains 100 mcg per daily dosage of 4 capsules. The amount is generally sufficient for most people, but it may vary slightly if you are taking larger amounts of Vitamin D3, so this is something to consider as well!

    I hope this helps! If you have any follow-up questions, please give us a call at 1-800-820-0184 (US & Canada Toll-free) or email [email protected] for personalized support :).

    – Yoori

  76. Michele Braen

    January 8, 2024 , 7:37 am

    What is the right balance of Vitamin D, K, and A. You say we need all three but you don’t say what the right amount is or if you did I missed it.

  77. Yoori AlgaeCal

    January 8, 2024 , 5:48 pm

    Thank you for reaching out, Michele! Vitamin D3 supplementation requirements vary from person to person depending on the amount of vitamin D in your blood. To determine the most accurate amount of Vitamin D3 levels in your body, it is strongly recommended to perform a vitamin D 25(OH)D blood test. With this information, you will be able to make an informed decision with your doctor for how much YOU need to supplement to get into a healthy range. You can read more on this in our Vitamin D guide here.

    Vitamin D and Vitamin A work together and their intake should be comparable. For example, if you are consuming 2,000 IU of D3 daily (14,000 IU per week), then you should be getting approximately the same amount of vitamin A daily/weekly.

    Finally, the vast majority of us (85-95%) will find vitamin K2 in its MK-7 form at a dose of 100 – 180 micrograms per day is adequate. However, if you are taking a high dosage of D3 (above 5000 IU), then an additional 100mcg K2 would be suitable.

    Of course, we always recommend confirming with a healthcare professional on the optimal dosage of vitamins that would work best for YOU! 🙂 If you have any follow-up questions, do let us know!

    – Yoori

This article features advice from our industry experts to give you the best possible info through cutting-edge research.

Lara Pizzorno
MDiv, MA, LMT - Best-selling author of Healthy Bones Healthy You! and Your Bones; Editor of Longevity Medicine Review, and Senior Medical Editor for Integrative Medicine Advisors.,
Dr. Liz Lipski
PhD, CNS, FACN, IFMP, BCHN, LDN - Professor and Director of Academic Development, Nutrition programs in Clinical Nutrition at Maryland University of Integrative Health.,
Dr. Loren Fishman
MD, B.Phil.,(oxon.) - Medical Director of Manhattan Physical Medicine & Rehabilitation and Founder of the Yoga Injury Prevention Website.,
Prof. Didier Hans
PHD, MBA - Head of Research & Development Center of Bone Diseases, Lausanne University Hospital CHUV, Switzerland,