do any vitamins cause hair loss
Too much vitamin A. Overdoing vitamin A-containing supplements or medications can trigger hair loss, according to the American Academy of Dermatology. The Daily Value for vitamin A is 5,000 International Units (IU) per day for adults and kids over age 4; supplements can contain 2,500 to 10,000 IU. What to do: This is a reversible cause of hair loss and once the excess vitamin A is halted, hair should grow normally.