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Glutathione exists in both the thiol-reduced (GSH) form and the disulfide-oxidized (GSSG) form

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A 2025 systematic review by Sarkar, Yadav, and colleagues in the International Journal of Dermatology analyzed evidence across topical (0.1-2%), oral (250-500 mg/day), and intravenous routes including five oral RCTs and additional topical and IV studies and characterized topical and oral glutathione as moderately effective (with topical 0.5% superior to lower concentrations and combined topical-plus-oral outperforming monotherapy) while explicitly flagging intravenous glutathione as contraindicated due to lack of efficacy and adverse side effects, citing a single placebo-controlled IV study in which 37.5% (6/16) of the treatment group versus 18.7% (3/16) of the placebo group achieved the endpoint (p = 0.054, not statistically significant)

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