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A useful mental discipline throughout this article is to keep asking, for each component, evidence for what , in which tissue, by which route? For GHK-Cu the honest answers are: matrix and antioxidant biology, in skin, largely topical a narrower claim than the blends branding implies

2013), the vast majority of potential Nrf2 modulators are electrophiles with an inherent propensity to interact with off-target cellular nucleophiles

Pick the next site in your rotation and wipe it with an alcohol pad

Injectable protocols follow different guidelines than topical applications

CONCLUSION: In spite of widespread reported use, there are no studies of IV GSH use for skin lightening or of its safety for chronic use (for any indication)