Platelet Rich Plasma Injections for Hair Loss Platelet Rich Plasma (PRP) injections to the scalp stimulates dormant hair follicles, waking them up, resulting in new and thicker hair growth. This is an exciting option for men and women with hair loss and balding which utilizes the powerful growth factors within your own blood. A small amount of the patient's blood is collected, spun down to separate the various components, and the plasma, containing highly concentrated growth factors, is painless