5 alpha reductase
5-alpha reductase is an enzyme that converts testosterone into dihydrotestosterone (DHT). This enzyme is responsible for androgenetic hair loss in human, gradually reducing the hair growth phase (anagen phase). At puberty, the 5-alpha reductase leads to an overproduction of sebum (the sebaceous gland), which can cause acne. The term Reductase refers to the enzyme that reduces energy sent into the chemical process of electron exchange (redox).
Some products such as the concentrate 5 alpha regulator and the 5 alpha regulator shampoo control the 5-alpha reductase to reduce the phenomenon that results in hair loss.