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What GHK-Cu Actually Is: A Cosmetic Copper Tripeptide, Not a Hair Drug GHK-Cu is one of the most studied small peptides in the skin sciences, and its origin story is worth knowing because it frames everything that follows

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Glutathione in the epithelial lining fluid (ELF) of the lower respiratory tract is thought to be the first line of defense against oxidative stress (6)

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[DOI] [PubMed] [Google Scholar] 92.Ritchie K.J., Walsh S., Sansom O.J., Henderson C.J., Wolf C.R

Mechanistic and gene-expression human data