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GHK-Cu is the ingredient contained within the topical copper peptides that have been available in beauty clinics for forty years, the main caveat being that topical GHK-Cu must successfully penetrate the stratum corneum to access the dermis
Glutathione is broken down in the liver by an enzyme called gamma-glutamyl transferase (GGT) [4]
PubMed abstract and review article: Novo Nordisk
Proc Soc Exp Biol Med 190: 399402
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