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The strongest human evidence is topical, including the Leyden 2002 photoaging trial and a 2023 IRB-approved 21-woman topical NEEL gel study reporting an average 28% increase in skin collagen density at 3 months

While complete elimination of mature stretch marks is unlikely with any non-surgical treatment, GHK-Cu can visibly improve their appearance and texture over several cycles, particularly when combined with consistent topical application to the affected areas

GHK-Cu (glycine-L-histidine-lysine) is a small copper-binding peptide, which has a remarkable and well-documented ability to improve wound healing and tissue regeneration, regulate remodeling of connective tissue and synthesis of collagen, elastin and glycosaminoglycans, reduce inflammation and scarring, increase antioxidant-enzymes and protect cells from toxic by-products of lipid peroxidation

Disclaimer: GHK-Cu (50mg) is supplied strictly for laboratory research use only

Pete, as an RD, was impressed by the formula