For your skin
A "master antioxidant" your body already makes. In skincare it gently lightens overall tone and helps fade pigmentation when used consistently over months.
Want the science? Keep reading ↓Mechanism of action
Tripeptide antioxidant (γ-glutamyl-cysteinyl-glycine) that scavenges free radicals and shifts melanogenesis from dark eumelanin toward lighter pheomelanin by inhibiting tyrosinase.
Why we tier this moderate
5 cited papers across 2 countries. The mechanism is well-described and there's at least one controlled trial in the literature, but we tier this Moderate rather than Strong to stay honest about how many specific papers we cite directly.
Cited research
Sarkar R et al., Glutathione as a skin-lightening agent and in melasma: a systematic review, International Journal of Dermatology 2025
Wahab S et al., Combination of topical and oral glutathione as a skin-whitening agent: a double-blind randomized controlled clinical trial, International Journal of Dermatology 2021;60(8):1013-1018 — 8-week RCT showed combination significantly lowered melanin and raised lightness vs placebo
Dilokthornsakul W, Dhippayom T, Dilokthornsakul P, The clinical effect of glutathione on skin color and other related skin conditions: A systematic review, Journal of Cosmetic Dermatology 2019;18(3):728-737 — current evidence inconclusive but trend toward brightening of sun-exposed skin
Arjinpathana N, Asawanonda P, Glutathione as an oral whitening agent: a randomized, double-blind, placebo-controlled study, Journal of Dermatologic Treatment 2012;23(2):97-102
Shin JW et al., Erythrocyte malondialdehyde and glutathione levels in vitiligo patients, Annals of Dermatology 2010;22(3):279-83 — vitiligo patients showed significantly lower erythrocyte glutathione vs healthy controls, supporting glutathione depletion as a feature of pigmentary disorders
Sources: PubMed · KCI · J-Stage · CNKI · Wanfang · SFD · MFDS · Cochrane · SCCS · CIR. Every entry points to a specific document. See methodology for what each outcome label means.