NONE: Biotin, calcium, many others, are pitched to gullible people by unscrupulous con men. See a dermatologist if you have a significant issue. Nutrition is obtained from food. Eat your vegetables. There are THOUSANDS of nutrients in food which cannot be reproduced in any pill. People who eat normal food derive no benefit from vitamin pills.
Answered 1/8/2016
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A doctor has provided 1 answer
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