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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.
Iron and Other Nutrients. Protein isn't the only nutrient needed to maintain healthy hair. You also need iron, vitamin E, and trace minerals such as selenium, copper, and magnesium to help keep your hair in good shape.