In summary, despite high adherence to oral supplementation and a low frequency of side-effects, oral glutathione supplementation did not result in significant changes in biomarkers of lipid peroxidation, DNA adduct formation or glutathione status in healthy adults
However, due to the large molecular size, topical glutathione may have limited skin penetration, though it can still support skin health when combined with other active ingredients like vitamin C, kojic acid, or niacinamide
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Several controlled human trials show that GHK-Cu creams boost collagen production, reduce fine lines, and improve skin firmness
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