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The lack of comprehensive long-term studies necessitates a cautious approach to extended treatment protocols
Studies suggest that peptides purchased from online sources can have substantial impurities and contaminants
The GHK-Cu skin literature is genuinely substantial three decades of work reviewed in Pickart & Margolina 2018 (PMID 29986520) describes collagen and glycosaminoglycan stimulation, antioxidant gene modulation, and wound-healing effects
They start with 0.75mg or even 1mg daily instead of building up from 0.25mg
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