Suspect #5: Too much vitamin A, not enough vitamin D We're obsessed with popping multivitamins (or chewing the gummy versions) but as with most things in life, you can have too much of a good thing. Overdoing it on supplements containing vitamin A can actually trigger hair loss, Marotta explains, and if you look at the supplements in the grocery story aisle, it's disturbingly easy to sabotage your head of hair. "The daily value for vitamin A is 5,000 International Units (IU) per day for adults," he says. But supplements can contain anywhere from 2,500 to a whopping 10,000 IU.
Turns out, not getting enough vitamin D may be just as bad as overdoing vitamin A. Researchers at Cairo University found that women who experience hair loss had lower levels of D ... and the hair loss only worsened as the levels dropped.
Researchers still aren't completely sure of the role vitamin D plays with hair follicle growth, but women should aim for a minimum of 600 IU of vitamin D per day. Good sources of the vitamin include fortified milk and orange juice, and salmon. As for the vitamin A issue, double-check your supplement labels.
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