Diet can help. A high protein, low carb, low fat diet isn't only beneficial for your waistline - it also contains nutrients that are good for hair. Eat walnuts, canola oil, fish, and soy. All of which contain significant levels of hair-nurturing fatty acids. And gobble up eggs, meat, and poultry for their substantial stocks of vitamin B12, which strengthens existing hair.
Supplements on the market include Kerastase Nutrients Densitive Daily Anti-Hair Thinning, Anti-Hair Loss Dietary Supplement (60 tablets for $60, not approved by the FDA); Nick Chavez Plump 'N Thick Leave-In Thickening Creme Conditioner (under $25); Shu Uemura Fiber Lift Protective Volumizer (retails for $35); L'Oreal Professionnel Age Densiforce Shampoo (retails for $26); and Philip Kingsley Scalp Tonic (under $45). None are scientifically proven to be effective.
Product treatments: Minoxidil, contained in the product Rogaine, is an over the counter topical solution found at local pharmacies that is applied to the scalp to fight baldness. Minoxidil works by stimulating the growth cycle in hair follicles. It can be effective in treating hair loss in women, though unfortunately it takes about four months to actually kick in, and discontinuing the product means losing any regrowth.
Other growth aids include Viviscal (products range from $19.99 to $99.99), a vitamin supplement formulated to provide nutrients for hair growth, and Tricomin (products from $25 to $68), a spray that reinforces and protects hair from the root.
Propecia is a pill used to treat male hair loss. Sadly, it does not work for women, and women should not take it.