Is it possible for hair to regrow if my hair is already getting thin?

Depends on cause: There are many causes of thinning hair and some, like hypothyroidism or vitamin deficiency, are reversible. Vitamins needed for healthy hair include b3, b5, b6, b12, biotin & a, c, d, e & zinc. While deficiencies can cause hair loss & taking these may prevent hair loss, they are not proven to restore hair loss in most, but are worth a try. See http://www.Naturalnews.Com/012893.Html for other ideas.