Glutathione: key facts and figures, with sources
The essential numbers on glutathione for skin in one place: studies, doses, timelines and safety, each with its source.
- Glutathione is a tripeptide antioxidant (glutamate, cysteine, glycine) made mostly in the liver.
- Trials: 2% lotion for 10 weeks (30 women); 500 mg tablets for 4 weeks (60 adults); 250 mg for 12 weeks (60 women): modest effects.
- It does not change natural skin colour; injections for lightening lack trials and carry warnings.
What are the key facts about glutathione for skin?
Glutathione is an antioxidant the body makes from three amino acids. Small trials found modest, gradual drops in skin melanin: a 2% lotion over 10 weeks and 250–500 mg tablets over 4–12 weeks. It does not change natural skin colour, and injections for skin lightening lack trials and carry regulator warnings.
The molecule
| What it is | A tripeptide antioxidant made of glutamic acid (glutamate), cysteine and glycine; often written GSH |
| Where it is made | In the body's own cells, mostly the liver |
| Main job | Protects cells from oxidative damage and recycles vitamins C and E |
| Link to skin tone | Slows tyrosinase, the enzyme that makes melanin, and may shift production towards lighter pheomelanin (Sonthalia, Daulatabad & Sarkar, IJDVL 2016) |
The main clinical studies on skin
| Study | What was tested | Who and how long | Finding |
|---|---|---|---|
| Watanabe et al., 2014 | 2% oxidised glutathione lotion, twice daily | 30 healthy women, 10 weeks | Melanin index fell more on the treated side than placebo |
| Arjinpathana & Asawanonda, 2012 | 500 mg capsules daily | 60 healthy adults, 4 weeks | Melanin index fell at all six measured sites versus placebo |
| Weschawalit et al., 2017 | 250 mg a day, reduced or oxidised form | 60 women aged 20–50, 12 weeks | Trends to lower melanin, mostly not statistically significant |
What the reviews conclude
- A 2025 systematic review of topical glutathione (Khanna et al., J Clin Aesthet Dermatol 2025): promising, but studies are few, small and short.
- The Indian dermatology review (Sonthalia, Daulatabad & Sarkar, IJDVL 2016): short-term evidence is encouraging for creams and tablets, not strong enough to call glutathione a treatment for melasma, and no trial supports IV glutathione for skin lightening.
Timelines and numbers to remember
| Fresher look | Often 4–8 weeks of nightly use |
| Lighter-looking tan | Usually 8–12 weeks, with daily SPF 30+ sunscreen |
| Doses studied (tablets) | 250–500 mg a day, for 4–12 weeks |
| Cream tolerance | In the 10-week lotion study, 1 of 30 women had mild redness that cleared in two days |
| Injections | No clinical trial for skin lightening; warned against by regulators (US FDA warning, 2015) |
What glutathione does not do
It does not change natural skin colour, results fade without sun protection, and no cream, tablet or injection is proven to whiten skin permanently.
How to cite this page
GlutaNex. "Glutathione: key facts and figures, with sources." glutanex.co.in/glutathione-facts/. Please link to the original studies listed below as well.
- Watanabe F, et al. Skin-whitening and skin-condition-improving effects of topical oxidized glutathione: a double-blind and placebo-controlled clinical trial in healthy women. Clin Cosmet Investig Dermatol. 2014.
- Arjinpathana N, Asawanonda P. Glutathione as an oral whitening agent: a randomized, double-blind, placebo-controlled study. J Dermatolog Treat. 2012 (trial NCT01016080).
- Weschawalit S, Thongthip S, Phutrakool P, Asawanonda P. Glutathione and its antiaging and antimelanogenic effects. Clin Cosmet Investig Dermatol. 2017;10.
- Sonthalia S, Daulatabad D, Sarkar R. Glutathione as a skin whitening agent: facts, myths, evidence and controversies. Indian J Dermatol Venereol Leprol. 2016;82(3):262-272.
- Khanna R, Rambhia P, Chapas A. Systematic review of the efficacy and safety of topical glutathione in dermatology. J Clin Aesthet Dermatol. 2025;18(9):51-54.
- US Food and Drug Administration warning on injectable skin-lightening products, 2015 (as reported by MedEsthetics).
General information about cosmetic skincare, not medical advice. Results vary from person to person. See a dermatologist for persistent or changing pigmentation.
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