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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.
This is why vitamin D deficiency and hair loss go together. Studies have shown that inhibiting the vitamin D receptors in the follicle can actually cause alopecia (hair loss). If you were to deprive your body totally of vitamin D, you would not have one of the necessary building blocks essential to hair growth.