Glutathione
L-Glutathione · Master Antioxidant Tripeptide
Glutathione is the body's master antioxidant, a tripeptide produced naturally by the liver. It protects cells against free radicals, peroxides, and heavy metals while eliminating toxins including drugs and pollutants. Injectable glutathione bypasses gastrointestinal breakdown for superior bioavailability compared to oral supplements. Research supports benefits for neurological health, immune function, skin health, and anti-aging.
Overview
Glutathione is the body's master antioxidant, a tripeptide produced naturally by the liver. It protects cells against free radicals, peroxides, and heavy metals while eliminating toxins including drugs and pollutants. Injectable glutathione bypasses gastrointestinal breakdown for superior bioavailability compared to oral supplements. Research supports benefits for neurological health, immune function, skin health, and anti-aging.
Glutathione acts as the primary intracellular antioxidant, directly neutralizing reactive oxygen species and regenerating other antioxidants like vitamins C and E. It plays crucial roles in detoxification by conjugating with toxins for elimination, supports immune function through T-cell regulation, protects mitochondria, and maintains cellular redox balance. The thiol group of cysteine provides its antioxidant activity.
Research indications
What the compound has been studied for, grouped by body system. Effect size is the reported magnitude where it was measured — not a recommendation.
Primary cellular antioxidant that neutralizes free radicals and protects against oxidative damage.
Binds and facilitates elimination of heavy metals and environmental toxins.
Essential for hepatic detoxification pathways and liver protection.
IV glutathione showed improvements in mental function and speech quality in case studies.
Protects neurons against oxidative damage and supports brain health.
Improved Th1 cytokines and immune markers in HIV patients with supplementation.
Supports skin health with potential brightening effects through melanin modulation.
Combats age-related oxidative stress and supports cellular longevity.
A large effect in a weak study and a small effect in a strong one are different things. Effect size is never evidence of use in people.
- Class
- Tripeptide
- Chain length
- 3 residues
- Molecular weight
- 307.32 Da
- Half-life
- ~12 min
- Typical dose
- 100-600 mg injectable (100-200mg wellness, 200-600mg intensive); IV dosing higher (600-1400mg clinical)
- Frequency
- 2-3 times weekly for subcutaneous; weekly for IV infusions
- Cycle length
- 8-12 weeks
- Storage
- Lyophilized: 2-8°C refrigerated, protect from light; Reconstituted: 2-8°C refrigerated, protect from light
Molecular data
- Type
- Tripeptide
- Molecular weight
- 307.32 Da
- Chain length
- 3 residues
- Half-life
- 12 min
Dosing reference
Doses reported in the literature and by suppliers. These are a record of what has been used in research — reference, never instruction.
| Context | Route | Amount | Frequency |
|---|---|---|---|
| General wellness | SubQ | 100-200 mg | 2-3x weekly |
| Intensive therapy | SubQ or IV | 200-600 mg | 2-3x weekly |
| Detoxification | IV (clinical) | 600-1000 mg | Weekly IV |
| Parkinson's support | IV (clinical) | 1400 mg | 2-3x weekly |
| Daily supplementation | Oral | 250-1000 mg | Daily |
Interactions
Both support cellular energy and antioxidant systems; commonly combined in longevity protocols.
Glutathione regenerates oxidized vitamin C, creating synergistic antioxidant effects.
Both protect mitochondria; different mechanisms complement each other.
No known negative interactions.
Quality checklist
- ✓White to off-white lyophilized powder
- ✓Clear solution after reconstitution
- ✓Reduced (not oxidized) form
- ✓Intact vacuum seal
- !Slight yellowing may indicate oxidation
- ×Dark yellow or brown coloration
- ×Cloudy solution
- ×Strong sulfur odor (beyond mild)
What to expect
Safety
- Injection site reactions
- Mild nausea (usually with higher doses)
- Abdominal cramping
- Signs of allergic reaction (rash, difficulty breathing)
- Severe abdominal pain
- Signs of zinc deficiency
- Known allergy to glutathione
- Pregnancy or breastfeeding (insufficient safety data)
- Asthma (may trigger bronchospasm in some)
FAQ
Why is injectable glutathione better than oral supplements?
Oral glutathione has poor bioavailability due to GI breakdown by enzymes and stomach acid, with most being destroyed before absorption. Injectable glutathione bypasses GI degradation for direct cellular uptake. IV or SubQ delivery achieves 10-100x higher bioavailable concentrations than even liposomal oral forms.
Can glutathione actually improve skin tone or is it just a myth?
Glutathione shows legitimate skin-lightening effects through melanin modulation—systematic reviews found oral glutathione at 250-500mg significantly reduced melanin index versus placebo. IV glutathione also shows effects but with variable and controversial results. It's not a myth but results vary greatly individually.
Does glutathione help with Parkinson's disease?
A double-blind pilot study found IV glutathione (1,400 mg, 3x weekly for 4 weeks) was well-tolerated in 21 Parkinson's patients with preliminary suggestions of symptomatic benefit. However, effects were modest. It's a research-supported adjunct therapy rather than a primary treatment, requiring medical supervision.
What's the difference between reduced and oxidized glutathione?
Reduced glutathione (GSH) is the active antioxidant form that neutralizes free radicals. Oxidized glutathione (GSSG) is the inactive form after neutralizing a free radical. You want reduced glutathione supplements—oxidized forms provide no antioxidant benefit. Quality products specify 'reduced' on the label.
References
- 1Glutathione metabolism and its implications for healthWu G, Fang YZ, Yang S, Lupton JR, Turner ND · Journal of Nutrition · 2004
Comprehensive review establishing glutathione's roles in antioxidant defense, nutrient metabolism, regulation of gene expression, DNA/protein synthesis, cell proliferation and apoptosis, immune response, and protein glutathionylation.
reviewPubMed 14988435 ↗ - 2Randomized, double-blind, pilot evaluation of intravenous glutathione in Parkinson's diseaseHauser RA, Lyons KE, McClain T, Carter S, Perlmutter D · Movement Disorders · 2009
21 PD subjects randomized to IV glutathione 1,400 mg or placebo 3x weekly for 4 weeks. Well tolerated with no safety concerns. Preliminary data suggested possibility of mild symptomatic effect.
human-rctPubMed 19230029 ↗ - 3Liposomal Glutathione Supplementation Restores TH1 Cytokine Response to Mycobacterium tuberculosis Infection in HIV-Infected IndividualsLy J, Lagman M, Saing T, Singh MK, Tudella EV, Morris D, Anderson J, Daliva J, Ochoa C, Patel N, Venketaraman V · Journal of Interferon & Cytokine Research · 2015
13-week liposomal glutathione supplementation in HIV-infected individuals resulted in significant increases in plasma Th1 cytokines IL-12 and IFN-γ, restoring immune response.
reviewPubMed 26133750 ↗ - 4Exploring the Safety and Efficacy of Glutathione Supplementation for Skin Lightening: A Narrative ReviewVarious · Cureus · 2025
Narrative review concluding glutathione has potential as a depigmenting agent. Oral supplementation shows significant but variable melanin reduction. IV use associated with safety concerns including anaphylaxis.
reviewPubMed 40013212 ↗