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Because GHK-Cu is a copper complex, the lab documentation should be specific enough that you are not just looking at a generic peptide purity claim

PMID: 29 SinghMDingYZhangL-YSongDGongYAdamsSet al
[DOI] [PubMed] [Google Scholar] 211.Vasdev S., Mian T., Ford C.A., Longerich L., Parai S

The remaining chiral amino acids, having lighter atoms in that position, have S chirality

A., Zhu Q
