How much biotin does it take to regrow hair? Most of the websites touting biotin for hair growth recommend taking 2-5 milligrams (2,000-5,000 mcg) of biotin in supplement form each day, and many supplements are sold under the name Biotin 5000, indicating a 5000 mcg (5 mg) size.
Does biotin help existing hair? “While, in the past, there was belief biotin supplements were needed to grow strong and healthy hair, there is actually little evidence that it makes much of a difference,” Dr. Bhanusali says. “Most dermatologists tend to agree—while it likely doesn’t hurt, taking biotin may not make much of a difference in your hair.
Does biotin repair damaged hair? You’ve probably seen biotin on the ingredient lists of prenatal vitamins or hair growth supplements. This B vitamin (it’s also known as vitamin B7) can help strengthen the development of hair follicles, particularly if hair is damaged or lacking strength.