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It serves as a cofactor for glutathione peroxidases, and is involved in the regulation of the nitric oxide cycle

10.1016/j.lssr.2024.01.002 151 WangM.WangL.TanX.WangL.XiongX.WangY.et al (2022b)

The current findings disagree with Wantanable and colleagues , who observed a good evidence favoring efficacy of topical oxidized glutathione 2% lotion when applied twice daily for 10 weeks in producing skin whitening and also statistically significant reduction of skin melanin index by using Mexameter (a tool objectively measures melanin index of the skin) compared with placebo

Bioessays 42, e2000119

In some cases, grey hair may be prevented (or at least slowed down), but this is only true if genetic factors aren't at the root of premature greying