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For research use only.

Glutathione

Antioxidant tripeptide · not a typical research peptide
What it is

Glutathione is a three-amino-acid thiol peptide (gamma-glutamyl-cysteinyl-glycine) that cells make to help manage redox balance and detoxify reactive molecules.[1][2]

Origin: Present throughout the body as a natural antioxidant peptide; clinical research has tested oral, topical and intravenous forms for skin pigment and neurologic questions among other uses.[1][2][3]

What researchers study it for

Research areas

Human studies and reviews point to several research angles.

  • Skin lightening and melasma, including topical, oral and intravenous forms reviewed in clinical literature[1][2]
  • Intravenous reduced glutathione in early Parkinson’s disease in a small open-label series[3]
  • Broader antioxidant and detoxification biology inside cells[1]

Evidence level

Level 3 of 4: Small human trialsClinical reviews of glutathione for pigment and a small open-label intravenous series in early Parkinson’s disease report human use, without large approval-supporting trials for those research uses.[1][2][3]

Why so few human trials?

Cautions

Studies and regulators point to several reasons for care.

  • Reviews note that evidence for systemic glutathione as a skin-lightening agent is limited and mixed, and safety questions remain for some routes[1][2]
  • The Parkinson’s intravenous series was open-label and small, so it cannot prove benefit[3]

Glutathione is not FDA approved as a drug for skin lightening or Parkinson’s disease.[1][2]

Also called

Glutathione goes by several names.

  • GSH, the usual abbreviation for the reduced form[1][3]
  • gamma-Glutamyl-cysteinyl-glycine[1]
  • Reduced glutathione, when the active thiol form is specified[3]

Good to know

Cells keep a large pool of reduced glutathione to buffer oxidizing stress; that everyday role is why researchers also test it as a supplement or intravenous agent.[1]

Handling

Storage basics General

These general basics apply to most freeze-dried research peptides.

Most research peptides come as a freeze-dried powder in a sealed vial
Unmixed vials are generally kept cold, dry, and away from light
Mixed solutions are generally refrigerated, since they are less stable than the dry powder
Peptides 101For mixing basicsNPL Dose CalculatorTo work out concentration after mixing
Go deeper

Sources and studies

These studies and official pages are the research behind this profile.

  1. 1Glutathione as a skin whitening agent: Facts, myths, evidence and controversiesSonthalia S, et al. (2016) · Indian Journal of Dermatology, Venereology and Leprology
  2. 2Glutathione as a skin-lightening agent and in melasma: a systematic reviewSarkar R, et al. (2025) · Nutrition Reviews
  3. 3Reduced intravenous glutathione in the treatment of early Parkinson's diseaseSechi G, et al. (1996) · Progress in Neuro-Psychopharmacology & Biological Psychiatry
  4. 4Glutathione synthesisLu SC (2013) · Biochimica et Biophysica Acta