After PRP is made, it is injected into the scalp where the hair is thinning, so it can trigger the body's natural healing instincts. Research indicates that PRP promotes hair growth by stimulating hair follicle stem cells. The platelet growth factors induce follicle stem cells to shift from a dormant state to an active state, and that starts the process of hair production.
PRP for hair restoration is best for patients whose hair is starting to thin. Patients who have active infection on the scalp, diabetes, and are on blood thinning medications are not good candidates for PRP.