G
GHK
Full name: Glycyl-L-Histidyl-L-Lysine
The tripeptide core of GHK-Cu, found naturally in human plasma, saliva, and urine. Concentrations decline with age (200 ng/mL at age 20 vs. 80 ng/mL at age 60). Research by Loren Pickart has documented its roles in tissue remodeling, wound repair, angiogenesis, and modulation of over 4,000 human genes including those involved in metabolism and nervous system function.