Over half of all men and women are affected by thinning hair at some point in their lives. There are many things that can be done to treat thinning hair such as eating more protein, taking hair growth supplements, or even getting hair transplants. Over the counter topical hair re-growth or thickening products are also available by the masses. Although most of these are completely safe to use, very few of them actually have the evidence to prove that they work. Thickening Products work by coating the hair shaft thus giving it a thicker appearance. Once you wash your hair, it goes back to the original density size. A good majority of these products are put in pretty bottles and have a marketing team behind them that claim they have the magic potion for hair loss. Very few of these topical products have been reviewed by the FDA and only Minoxidil (the active ingredient in Rogaine) has been medically proven to be effective.