While its cosmetic applications are relatively new, PRP has a long history of use in orthopedic medicine, reconstructive surgery, and dentistry. It is a popular treatment for joint, tendon, and tissue injuries in professional athletes because it greatly reduces the amount of time the athlete is out of play after an injury. Platelet-rich plasma is rich in platelets and growth factors, which are known to stimulate stem cells. Stem cells in turn stimulate the growth of collagen to help the body heal and regenerate more quickly.