And the term "copper peptides" itself is doing a lot of unearned work, because it lumps together GHK-Cu (the molecule with 50 years of evidence) with AHK-Cu, GHK-NH2, and a range of synthetic copper-binding sequences that have far thinner mechanism data
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However, the faster it builds up, the worse you feel
Wen M, Wei C, Hu Z, Srivastava K, Ko J, Xi S, et al
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How the committee voted, substance by substance Where the reporting disagrees