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iTat transgenic mice exhibit hyper-locomotion in the behavioral pattern monitor after chronic exposure to methamphetamine but are unaffected by Tat expression

Separately, GHK-Cu has been found to stimulate fibroblast proliferation while upregulating genes for collagen, elastin, dermatan sulfate, chondroitin sulfate, and decorin key structural components of the skin's extracellular matrix and to modulate matrix metalloproteinases (MMPs) and their inhibitors, which supports balanced remodeling rather than excessive breakdown or fibrosis

For that account to hold, human clearance would have to differ from every species measured by orders of magnitude possible in principle, but nobody has looked

A purity number without the supporting chromatogram is just a claim, not evidence