Male Pattern Baldness: When men lose their hair, they tend to lose it in predictable ways, around the hairline and the crown of the head. This happens because the metabolism of Androgen gets involved with an enzyme called 5 Alpha Reductase. This combines with the male hormone, testosterone to create Dihydrotestoterone or DHT. This collision tends to build up on the dermal papilla, which is responsible for carrying the blood supply to the capillaries and tends to be similar to how plaque accumulates on our teeth. When the blood supply is compromised, this causes the hair to suffer and essentially it suffocates until it stops growing.