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GSH is exclusively degraded at the extracellular level by cells expressing -glutamyltranspeptidase (GGT), such as those of the hepatobiliary tree and of other organs like the heart, kidney, lungs, pancreas, and seminal vesicles

Repici M, Giorgini F

GHK-Cu is a naturally occurring tripeptide that promotes skin regeneration, collagen production, wound healing, and overall tissue repair while reducing inflammation and supporting hair growth