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hair loss
Jul 29, 2009

how much is too much of vitamin A when it comes to this issue.

Response from Dr. McGowan

Excess vitamin A intake usually occurs from taking supplements, but may also be due to eating liver in large amounts. High doses of vitamin A taken over a short period of time can cause toxicity faster. Vitamin A, unlike vitamin C is stored in the fat of the body and can build up over time. The Institute of Medicine has established Daily Tolerable Upper Levels (UL) of intake for vitamin A from supplements that apply to healthy people, in order to help prevent the risk of vitamin A toxicity. These levels for preformed vitamin A in micrograms (g) and International Units (IU) are:

0-3 years: 600 g or 2000 IU 4-8 years: 900 g or 3000 IU 9-13 years: 1700 g or 5665 IU 14-18 years: 2800 g or 9335 IU 19+ years: 3000 g or 10,000 IU

Best, Joe

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