Answers to Vitamin D Overdose Misconceptions

Fears of a vitamin D overdose are unwarranted, is the message from Dr John Jacob Cannell, at the Vitamin D Council. He explains this position in a noteworthy article on Vitamin D Toxicity, in which he demonstrates why we need much more vitamin D than the US RDA of 400 IU would suggest.


In this article, he shows that 10,000 IU a day of vitamin D has not been proven to be toxic, even when taken over a long period of time. If just 30 minutes of sunbathing can produce 10,000 IU in a light-skinned person, this fact has great implications about how much vitamin D our bodies really need. When compared with the levels that nature uses, it’s not hard to see that 10,000 IU is not a vitamin D overdose.


Vitamin D is theoretically toxic in enormous doses, but the same could be said for water. In that sense, vitamin D is at least as safe as water.


For supplementation purposes, two kinds of vitamin D are available, cholecalciferol (D3) and ergocalciferol (D2). Vitamin D3 is humankind and vitamin D2 comes from plants and fungus. Dr Cannell, emphasises that D3 is safe for uses in large amounts, but D2 is not safe in large doses. Vitamin D2 is the type prescribed by doctors in 50,000 IU tablets. Research has shown that D3 is much more available to the human body than D2.


Another reason for the vitamin D toxicity concern is that vitamin D hypersensitivity syndromes are often mistaken for vitamin D toxicity. The most common example has to do with parathyroid problems, which causes elevated levels of calcium in the bloodstream. Vitamin D wrongly gets implicates since it has a hand in the body’s calcium levels.


He closes his article with this great analogy, “living in America today while worrying about vitamin D toxicity is like dying of thirst in the desert while worrying about drowning.” This analogy says that we should be more worried about actual vitamin D deficiencies happening all around us than to be worried about the uncommon possibility of a Vitamin D Overdose.

Author: Abhista

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