PRP (Platelet Rich Plasma)- Started being used in the 1990's mainly by Orthopedic Surgeons, Dentists, and Cardiac Surgeons, and recently been expanded to the Cosmetic Surgery arena. 

Platelets contain the following growth factors and cytokines: 

• Platelet derived growth factors
• Transforming growth factor beta
• Fibroblast growth factor
• Insulin-like growth factor 1
• Insulin-like growth factor 2
• Vascular endothelial growth factor
• Epidermal growth factor
• Interleukin 8
• Keratinocyte growth factor
• Connective tissue growth factor