PRP injections can be effective in treating hair loss in men, both in preventing hair loss and in promoting new hair growth. PRP can also help stimulate hair growth after hair transplantation. A small amount of the patient’s blood is collected and then passed through a centrifuge to separate the platelet-rich plasma from the red blood cells. The plasma is then injected into the scalp in a grid pattern. The treatment takes approximately an hour to complete. A treatment cycle usually consists of 3 PRP sessions with a series of injections each month for 3 months. Continuous maintenance treatment every six months is recommended.