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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.
Top 5 Hair Vitamins to Grow Longer Hair. THE BEST HAIR VITAMINS FOR HAIR GROWTH. We spent time thoroughly researching and testing dozens of products within the hair vitamin/hair growth supplement space to provide you with what we consider to be the top 5 hair growth vitamins that will help you grow longer, thicker, more voluminous hair.