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Question:
If vitamin K absorption appears to be reduced by other fat-soluble vitamins, like vitamin D, why do some "bone health" supplements combine them? Should they be taken separately?

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Karen16620   March 22, 2018
I was taking Vitamin D for a few years trying to get my numbers up out of the insufficient range. Didn't happen. Then I heard that D and K should be taken together. I bought a supplement like that and my next blood test --Voila! went up 7 points and OUT of the "insufficient" range.

Bob11069   July 10, 2016
+This comes as a surprise as I have heard from many sources that Vitamin K increased the absorption of Vitamin D. Could you please clarify this?

ConsumerLab.com   July 11, 2016
Hi Bob - We are not aware of any evidence suggesting that vitamin K increases vitamin D absorption. You may be confusing this with the fact that getting adequate amounts of each are helpful for bone health. However, this does not mean that one increases absorption of the other or that they should be taken at the same time.

Judith11761   March 1, 2017
Dr. Mercola's website suggest they be taken together and even have a formula combining the two

Nell13883   April 1, 2017
i was told to take 50000 units of vit d i feel that is to much i do a lot of reading and was concerned that you could take to much ive read your article. a dr. told me to take this amount. i take dr.mercola brand but not the whole amount my vit d levels were 31 . i know you cant tell me what to take would appreciate a comment

ConsumerLab.com   April 1, 2017
The amount you need depends on your age, gender, how much you may already get, and other factors. See the information at https://www.consumerlab.com/reviews/vitamin_D_supplements_review/Vitamin_D/#howmuch

This CL Answer initially posted on 7/8/2016. Last updated 7/26/2017.

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