NL GHK Cu in lung diseases Synthagen PL GHK Cu longevity peptide. Your body makes it. Peaks at 20. Down 60% by 60. 50 years of research says it: Modulates 4,000+ genes toward younger expression Regenerates bone and connective tissue Skin can change when biology is supported, GHK Cu is a naturally occurring copper binding peptide thats been studied for its role in: Supporting collagen and elastin production, Improving skin Copper Peptide GHK Cu Face Serum RegenMed Direct