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Comparison: Glutathione vs
doi: 10.1111/CEI.12686 22 CoughlanM
Copper peptide GHK-Cu got its name because its comprised of the element copper and three linked amino acids or the tripeptide glycine, histidine, and lysine
Why this matters for dosage: the same mcg number means something different depending on purity
Avoid repeated freeze-thaw cycles peptide integrity degrades measurably after the third cycle (documented via HPLC stability testing)
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