Normal healthy hair is constantly growing in cycles. People lose a certain number of hairs daily and hair follicles usually cycle through growth and loss randomly, so that you’re never losing large amounts of hair all at once. The two important phases of the hair cycle are a growing phase (called Anagen) and a resting phase (called Telogen). In the resting phase, hair follicles are dead, which means they are not growing at all. At any one time, 90% of scalp hairs are actively growing, while 10% are resting. Healthy hair follicles are fed by the blood stream, which carries nutrients required to generate new hair growth and sustain a healthy hair growth cycle.