Hair loss may be caused by heredity, male pattern baldness, diet, medications, postpartum changes, menopausal changes and stress. Hair follicles weaken over time in the scalp's vascular network when the enzyme 5-alpha-reductase converts testosterone to dihydrotestosterone or DHT. DHT disrupts the binding of essential proteins and nutrients to cells in the follicle and in turn, this lack of nutrients leads to weakening of the follicle. It also shortens the anagen stage of the hair follicle which is the growing stage and increases the telogen stage or resting stage in the hair growth cycle which leads to thinning hair and hair loss. DHT causes 95% of hair loss. If the hair follicle is still active, if you have thinning hair, or if you are just starting to experience hair loss, laser is a great option for you.