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The commercial cosmetic use does not constitute approval of the compound as a medicine and does not establish efficacy claims at the level of evidence required for pharmaceutical regulation

However, unlike Cys270, Cys199 is surface-exposed, which may fit the observation that about half of the SOT were retrieved in the recent persulfidome analyses

GHK-Cu is shorthand for the glycyl-L-histidyl-L-lysine copper complex , a small peptide made of three amino acids bound to a single copper ion

As far as I know, it isn't growth promoting

Unmodified peptides with free N-terminal amino groups serve as substrates for aminopeptidases, enzymes that sequentially cleave amino acids from the N-terminus