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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.
1 Biotin and Other B Vitamins: Biotin and many other B-complex vitamins also contribute to healthy hair. 2  A B-complex supplement can guard against vitamin B deficiencies that may cause excessive hair loss in women.itamin Deficiency and Hair Loss in Women. Possible causes of hair loss in women are many. Keep in mind the thickness, color, texture and rate at which hair grows is governed not just by vitamins and environment but also by genetics.