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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.
If they really made your hair grow faster, it would be all your hair, including legs and arms. All a vitamin supplement will do is to give your body a bit of extra nutrients so that it can grow healthier hair, not grow it faster. Source(s):