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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.
Vitamins. Vitamin deficiency can cause hair loss or hair to grow slowly. Avocados are high in vitamins B and E, which work at the cellular level to protect and strengthen hair. Vitamin B is essential for hair growth. Vitamin E helps repair damage on the scalp, which may slow or prevent hair growing.