Too Much Vitamin D?

March 10, 2013

A client emailed that he heard a doctor on a talk show recommending 5,000 IU of Vitamin D instead of the RDA of 400 IU. He asked me what I thought.

I said that everyone thinks there’s a Vitamin D deficiency epidemic but I’m not convinced. The big question is, why all of a sudden are we so deficient. What could Vitamin D be responding to and what do the low levels indicate?

Here’s one possible answer. Vitamin D is really a hormone with a feedback loop to calcium. When the body has enough calcium less Vitamin D is required and the levels drop.

We are a calcified country, so the effect of high calcium may be lower levels of Vitamin D. And without understanding the complex chemistry involved, most people think we just need to take more.

But MORE Vitamin D pulls in more calcium and bumps out magnesium, making people more magnesium deficient.

Taking high dose Vitamin D (anything above 2,000 IU) will also use up your magnesium because this mineral is required to change the supplemental/storage form of Vitamin D into active Vitamin D.

Not everyone is going to suffer from too much Vitamin D and enough people seem to benefit from it (at least in the short term) that it’s not going to ring any alarm bells for many years. After all, it took about 3 decades for us to realize that high dose calcium supplementation was causing heart disease and soft tissue calcification when not properly balanced with magnesium.

Do your research before taking high dose Vitamin D. Google the benefits AND the dangers before you make a decision. If you do a Vitamin D blood test, remember a mid range level is better than a high level.

Carolyn Dean MD ND

The Doctor of the Future®

RESOURCES: Along the borders and in the links of my web site you can find my books, writings, and my call-in radio show. Email your questions to: questions@drcarolyndeanlive.com.

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