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Oncotarget 8, 1819118205

This makes collagen synthesis a central research theme, although collagen-related cellular findings should not be translated into guaranteed skin tightening claims

For cognition and mood support, Rogan takes things like L-theanine, apigenin, and nootropics

Organ strain: Excessive use can impact kidney or liver function

That is a mechanistically attractive claim, and the pathway itself is unquestionably central to hair biology but the strength of the direct evidence tying GHK-Cu specifically to Wnt activation in human follicles is weaker than the confident phrasing online implies, and much of it is filtered through commercial rather than primary literature