Ask the Insider: Thoughts on supplementing vitamin K2 with vitamin D3?

Hi Doc. There is some talk about the need to combine vitamin K2 with vitamin D3 supplementation. Could you give us your views on that?”

Dr. Micozzi:  Thank you for  your question. There has indeed been a lot of talk about vitamin K2 over the past year or two. So it is perfectly reasonable to have questions. But in my view, it is just that—a lot of talk.

This is another example where the talk in the natural products industry has gotten way ahead of the science.

It’s not that I don’t think vitamin K has a valuable role in human health. For decades, medical science has recognized vitamin K for its role in preventing hemorrhaging and blood loss. This function is, of course, critical—and potentially lifesaving.

But we still don’t even know what the human nutritional requirements for vitamin K2 are. We do know, however, that there are dangers associated with excess vitamin K consumption.

So, I don’t believe there is any responsible medical or scientific basis for taking vitamin K supplements unless you are specifically found to be deficient in this nutrient by a physician.

The bottom line is, there simply isn’t enough evidence to support general daily supplementation with this nutrient.

On the other hand, the evidence supporting the need for vitamin D supplementation is overwhelming—and growing every day. In fact, I’ll give you even more important news about vitamin D’s health benefits (this time, for lung disease) in next month’s issue of Insiders’ Cures.

In the meantime, don’t let the unanswered questions about vitamin K2 keep you from getting enough vitamin D3. I recommended 5,000 IU of vitamin D per day—especially this time of year.


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