Condition
    Moderate Evidence
    Effectiveness 2/5

    Glutathione for Melasma

    Oral glutathione is heavily marketed for skin lightening including melasma, but the supporting trials are small, short, and low quality with inconsistent results — it should never displace sun protection, which remains the most effective melasma intervention.

    Overview

    Oral glutathione is heavily marketed for skin lightening including melasma, but the supporting trials are small, short, and low quality with inconsistent results — it should never displace sun protection, which remains the most effective melasma intervention.

    Verdict

    Mixed evidence

    How It Works

    Glutathione is the body's main intracellular antioxidant and can shift melanin production from dark eumelanin toward lighter pheomelanin in laboratory studies. However, oral glutathione is substantially broken down during digestion, and whether meaningful amounts reach skin melanocytes is questionable.

    Dosing & Protocol

    Typical dose

    Recommended dose
    Not established; trials used 250-500 mg daily
    Expected timeframe
    Unknown; purported effects take 1-3 months

    Protocol

    form
    Oral reduced or liposomal glutathione; topical glutathione has also been trialled
    duration
    12 weeks, matching trial length
    co factor
    Daily broad-spectrum SPF 50 is non-negotiable — melasma relapses with ultraviolet and visible light exposure regardless of any supplement. An iron-oxide-tinted sunscreen adds visible-light protection
    titration
    Up to 500 mg daily; trials did not show clear dose-dependent gains, and intravenous glutathione for skin lightening is not recommended on safety grounds
    starting dose
    250 mg oral glutathione daily, the lower of the two doses used in randomised trials

    Evidence

    What the studies say

    A handful of small randomised trials (mostly from Southeast Asia) report modest skin lightening with oral glutathione over 4-12 weeks, but methodological quality is low, effects are small, and results have not been consistently replicated. No long-term safety data exist for sustained high-dose use, and regulatory bodies in several countries have cautioned against its use for cosmetic lightening.

    Glutathione as a skin-lightening agent and in melasma: a systematic review

    Score: 6/10
    2025
    systematic_review

    Sarkar R, et al.

    Topical versus oral glutathione both provide moderately efficacious skin-lightening outcomes... IV glutathione is contraindicated due to lack of efficacy and side effects.

    View source

    Safety

    Caveats

    Long-term safety unestablished at high doses. Not a substitute for sunscreen.

    Less likely to help if

    People with dermal or mixed-type melasma, those with ongoing unprotected sun exposure, and those whose pigmentation is driven by combined oral contraceptives or pregnancy hormones without those factors being addressed.

    Medical Disclaimer

    The information provided on this website is for educational and informational purposes only and is not intended as a substitute for professional medical advice, diagnosis, or treatment. Always seek the advice of your physician or other qualified health provider with any questions you may have regarding a medical condition or before starting any supplement regimen.

    Individual results may vary. The statements on this website have not been evaluated by the Food and Drug Administration. Products and information are not intended to diagnose, treat, cure, or prevent any disease.