Platelet Rich Plasma is basically a autologous blood that has been centrifuged to have above normal concentration of platelets. Platelet rich plasma contains growth factors and other cytokines which stimulate healing of bone and soft tissue. This is why PRP is used to rejuvenate the skin including reducing scars from acne. In this case, the platelets work to increase collagen, angiogenesis, fibrin matrix and the formation of new cells which help improve the texture of the skin, its tightness and youthfulness. PRP is a more natural way of maintaining youth without having to over expose to dermal fillers.
When used to stimulate hair growth most doctors recommend treatments at intervals of 3 to 6 months. Some improvement can be expected in the first 2-6 months. The treatments must be continued periodically to maintain any improvement.