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Description
doi: 10.1038/ki.1994.264
[DOI] [PMC free article] [PubMed] [Google Scholar] 23.Greene S.C., Noonan P.K., Sanabria C., Peacock W.F

GHK-Cu is also shown to stimulate collagen and elastin, smoothing and firming the skin over time without the potential skin irritation of prescription tretinoin or over-the-counter retinol
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