Bosley is the most recognized hair resoration brand in the world.  Bosley has recognized that poor scalp conditions and genetics are the major contributing factors to hair loss in men and women. DHT is a chemical produced by the body that restricts blood flow to the hair follilce. Bosley haircare cleanses away the DHT and contains DHT inhibitors allowing healthy hair to grow. Bosley is guranteed to grow thicker fulller hair in 30 days. In addition to shampoo and conditioner they also offer targeted treatments for excessive hair loss.