uses JavaScript to provide the best possible experience for our content, but your browser has it disabled. Learn how to enable it here.



Vitamin K and vitamin D may each play a role in bone health, which is why they are often included together in bone health supplements. However, it may be best to take vitamin K apart from other fat-soluble vitamins, as explained in the What to Consider When Using section of the Vitamin K Supplements Review.

Join today to unlock all member benefits including full access to all CL Answers and over 1,300 reviews.

Join Now

Join now at


Join the conversation

February 12, 2020

Like Karen and Bob, I've read that you should take Vitamin D and K together. This seems to be a theme that's out there. What do you suppose the thinking is behind this assertion. The key word here is 'together.'

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.

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?
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.

March 1, 2017

Dr. Mercola's website suggest they be taken together and even have a formula combining the two

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
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

Join today to unlock all member benefits including full access to CL Answers

Join Now

Join now at