DHT hair loss is caused by the DHT (dihydrotestosterone) hijacking receptor cells and sends an incorrect message to cells in the hair follicles that would otherwise initiate hair growth. This is a complex problem, and there are many products that claim to nullify DHT hair loss.
The presence of DHT is necessary in men to counter the effects of the predominantly female hormone, estrogen. In fact, dihydrotestosterone is three times more potent than regular testosterone, and is essential in male growth characteristics that differentiate the male body from the female body, such as larger muscles, deeper voices, increased sex drive, and more hair growth on the body and face.
Unfortunately, in some males, when DHT interacts with hair follicles it can cause hair loss. DHT hair loss is actually the main perpetrator of baldness in men, and can even cause hair loss for some women. For this reason most hair loss treatments are targeted towards reducing, or negating, DHT interaction with hair follicles, through shampoos and creams.
For more information on treating dht hair loss, see hair loss product