Each hair follicle experiences regular phases of growth and transition. This process is called the hair growth cycle and consists of 3 different stages: During the anagen phase (growth phase) the hair roots are activated and new hair production is initiated. The cell production is ended in the catagen phase (transit phase). In the last stage – the telogen phase – the old hair is released and the hair follicle rests until the hair falls out. The change from one phase to the next takes some weeks. The hair cycle can be positive influenced by active agents. The key substance Black Sea Rod Oil, significantly extends the anagen phase (growth phase) of the brows and reduces the number of hair in the catagen and telogen phases (hair release). The roots are stimulated and cell division and hair growth are activated.