Pal-GHK (also called palmitoyl tripeptide-1 and palmitoyl oligopeptide) is a synthetic peptide known for its effects on collagen, skin health, and skin pigment. It is currently under investigation for its ability to boost collagen synthesis in animal models as well as for its ability to stimulate blood vessel growth.
GHK-Cu is a naturally occurring peptide first isolated from human blood plasma. It has since been identified in urine and saliva as well. Research into GHK-Cu has found the short peptide to have substantial benefits in wound healing and immune function. It has anti-aging properties and has been found to suppress free-radical damage, increase protein synthesis, fight bacteria, and increase the health of skin and skin fibroblasts.