Vitamin A is a very Puri Hair important vitamin because it generates sebum Puri Hair production in the scalp. This ensures that the scalp is in a prime state for hair growth. In scientific terms, it regulates the synthesis of retinoic acid inside hair follicles, in which, follicle stimulation facilitates. Another form of vitamin A, is beta carotene. This is also important in facilitating growth and maintaining healthy hair. Recommendation: Take 10,000 I.U of Vitamin A once a day.