Hair vitamins contain essential nutrients for the health of your hair and scalp. Vitamins C, Biotin and Zinc are among the best-known vitamins for hair growth. They play a part in maintaining good hair health and can help improve the appearance of damaged or thinning hair, since they nourish cells that produce healthy tissue. Vitamins are delivered directly to your bloodstream, where they take what is needed, without wasting any unnecessary energy. When taken as directed, these vitamins can help your hair to grow faster and appear healthier.