PRP Scalp Therapy consists of injections of platelet-rich plasma cells into the affected area of your scalp. Plasma is the liquid part of your blood. Your blood is also made up of platelets, white blood cells and red blood cells. Platelets play a role in the clotting of your blood, but they also contain cytokines and proteins that promote growth, healing, and rejuvenation. This may be combined with medicine from your provider to achieve your hair restoration goals.