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For hair growth, be sure to get a balanced diet with Vitamin C, Biotin (i.e. Vitamin B7 or Vitamin H) and Niacin (Vitamin B3). If you cannot get enough of these vitamins in your diet, you may need to take a vitamin supplement for hair growth.
The following specific vitamins promote healthy hair: 1  Biotin promotes growth of existing hair, produces keratin, and works to increase hairâs elasticity. 2  Niacin (Vitamin B3) promotes blood circulation to the scalp.  Pantothenic Acid (Vitamin B5) strengthens and nourishes the hair follicle.