Supplement analysis backed by scientific evidence · PT

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Limited evidenceLongevity & antioxidants

Glutathione (Liposomal)

Oral glutathione can raise body glutathione stores — the old claim that it is entirely destroyed in the gut was overstated — but no trial has linked that increase to a clinical benefit, and cheaper precursors like NAC and glycine do the same job. The skin-whitening claim is not supported by good evidence.

What the science says

  • Raising body glutathione stores Moderate evidence

    A 6-month randomized placebo-controlled trial (Richie et al., 250 or 1,000 mg/day, 54 adults) found dose-dependent increases in glutathione in blood, erythrocytes, plasma and buccal cells — up to 30-35% at the high dose — reversing to baseline within a month of stopping. A separate 4-week trial of liposomal glutathione (500 or 1,000 mg/day) showed increases of 25-40% in blood glutathione stores. So absorption is real; the question is whether it matters.

  • Immune function Limited evidence

    The liposomal glutathione trial reported increases in natural killer cell cytotoxicity (up to ~400% at 1,000 mg/day) and lymphocyte proliferation, but it was small (n=12 completing the immune assays), unblinded in parts, and used ex vivo assays rather than clinical infection endpoints. No trial has shown fewer infections or better clinical immune outcomes.

  • Oxidative stress markers Limited evidence

    Effects on oxidative stress biomarkers have been inconsistent across trials; the Richie trial found a reduction in the oxidized-to-reduced glutathione ratio at 6 months but no change in F2-isoprostanes or other established markers. Biomarker movement without outcome data is the recurring theme here.

  • Skin lightening Limited evidence

    The popular skin-whitening use rests on a handful of small, short, mostly Southeast Asian trials with weak methodology and inconsistent melanin-index outcomes. Intravenous glutathione for skin whitening is explicitly warned against by the Philippine FDA and others after reports of serious adverse events including Stevens-Johnson syndrome, thyroid dysfunction and kidney failure.

Dosage & safety

Studied doseOral trials have used 250-1,000 mg/day of reduced glutathione (liposomal or standard) for 4 weeks to 6 months. Liposomal formulations appear to raise stores at lower doses but have not been head-to-head tested against equivalent-dose standard glutathione. A cheaper and better-evidenced route to raising glutathione is supplying precursors: N-acetylcysteine (600-1,800 mg/day) or the GlyNAC combination (glycine plus NAC).
SafetyOral glutathione is well tolerated; the Richie trial reported no significant adverse events over 6 months, with occasional flatulence and loose stools. Intravenous glutathione, widely sold in cosmetic clinics, is a genuine hazard — regulators in the Philippines, Thailand and elsewhere have issued warnings over severe skin reactions, renal and hepatic injury, and at least one reported death; there is no approved IV indication for skin lightening. People with sulfur sensitivity or asthma should be cautious (bronchospasm has been reported with inhaled glutathione). Theoretical concern with chemotherapy: glutathione is a major mechanism of tumour drug resistance, so do not supplement during platinum-based chemotherapy without oncologist approval.

Scientific references

Where to buy

Codeage, Liposomal Glutathione, 60 Vegetable Capsules (250 mg per Capsule)

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