The causes of hair loss are not well defined; however, researchers have found that men with male pattern hair loss have increased levels of dihydrotestosterone or DHT in the balding area of their scalps. Human hair normally follows a cycle of growth, falling out, and new growth. But increased levels of DHT are believed to contribute to the shortening of the growth phase, and a shortening of the time it takes for the hair to fall out. This results in a thinning of the hair on the scalp.

Finasteride (the active ingredient in PROPECIA) blocks the formation of DHT and, in this way, appears to interrupt a key factor in the development of inherited male pattern hair loss in men. PROPECIA has been proven to effectively lower DHT in the scalp.

Most important, PROPECIA helps grow natural hair, not just "peach fuzz," and is as convenient to take as a vitamin: one pill a day.