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ghk-cu long-term use tolerance diminishing returns Are We Ready to Measure Skin Permeation of Modern Antiaging GHK–Cu Tripeptide Encapsulated in Liposomes? Copper Peptide (GHK-Cu): Clinical Uses,
Description
Chem Commun (2017) 53(13):21225

Not all GHK Cu is the same

This would explain the increase in lean body mass

However, this study is available only as an abstract, and its reliability is largely unknown