oral glutathione melasma randomized controlled trial The effects of the supplementation of L‐Cystine associated with reduced L‐Glutathione‐GSH on human skin pigmentation: a randomized, double‐blinded, benchmark‐ and placebo‐controlled clinical - Duperray - 2022 Systematic Review of the Efficacy
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Drugs 8 (2), 255268

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Look for supplements that have been third-party tested for purity and potency, and consider consulting with a healthcare provider before beginning any new supplementation regimen

Carefully designed clinical studies are needed to help establish standardized dosing protocols
