Glutathione
Also known as: GSH, L-Glutathione, Reduced Glutathione, γ-glutamylcysteinylglycine
L-Glutathione | Master Antioxidant Tripeptide
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.
Key benefits
- Master antioxidant - protects against oxidative stress
- Detoxification of heavy metals and toxins
- Immune system support and T-cell function
- Neuroprotective effects
- Skin health and potential brightening effects
- Liver protection and function
- Mitochondrial support
- Anti-aging properties
Mechanism of action
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.
Molecular data
- Type
- Tripeptide
- Half-life
- ~10-14 minutes (IV)
Sequence
γ-Glu-Cys-Gly
Indications
What the research community uses this compound for, with self-reported effectiveness.
Antioxidant & Detox
Oxidative Stress Reduction
Most effectivePrimary cellular antioxidant that neutralizes free radicals and protects against oxidative damage.
Heavy Metal Detoxification
EffectiveBinds and facilitates elimination of heavy metals and environmental toxins.
Liver Support
EffectiveEssential for hepatic detoxification pathways and liver protection.
Neurological
Parkinson's Disease Support
ModerateIV glutathione showed improvements in mental function and speech quality in case studies.
Neuroprotection
ModerateProtects neurons against oxidative damage and supports brain health.
Immune & Skin
Immune Enhancement
EffectiveImproved Th1 cytokines and immune markers in HIV patients with supplementation.
Skin Health
ModerateSupports skin health with potential brightening effects through melanin modulation.
Anti-Aging
ModerateCombats age-related oxidative stress and supports cellular longevity.
Dosing protocols
Common protocols by delivery method. Adjust the curve below to model accumulation in your own cycle.
Injectable
Injectable glutathione is the most effective delivery method, bypassing GI breakdown for direct absorption. Subcutaneous injections are typically administered 2-3 times weekly. IV administration is fastest-acting but requires clinical supervision. Start with lower doses to assess tolerance.
| Protocol | Dose | Frequency | Route / duration |
|---|---|---|---|
| General wellness | 100-200 mg | 2-3x weekly | SubQ |
| Intensive therapy | 200-600 mg | 2-3x weekly | SubQ or IV |
| Detoxification | 600-1000 mg | Weekly IV | IV (clinical) |
| Parkinson's support | 1400 mg | 2-3x weekly | IV (clinical) |
Preparation
You will need
- Bacteriostatic water or sterile saline
- Insulin syringes
- Alcohol swabs
- Peptide vial
- Sterile work surface
Steps
- Clean work area and hands thoroughly
- Calculate required water volume
- Draw diluent into syringe
- Inject slowly into vial
- Gently swirl until dissolved (never shake)
- Store in refrigerator, protect from light
Work out the water volume and syringe units in the reconstitution calculator →
Oral
Oral glutathione has poor bioavailability due to GI breakdown. Liposomal formulations may offer improved absorption but are still less effective than injection.
| Protocol | Dose | Frequency | Route / duration |
|---|---|---|---|
| Daily supplementation | 250-1000 mg | Daily | Oral |
Interactions
Pairwise interactions with other compounds you might be cycling — the same data behind the cycle builder's safety check.
NAD+
SynergisticBoth support cellular energy and antioxidant systems; commonly combined in longevity protocols.
Vitamin C
SynergisticGlutathione regenerates oxidized vitamin C, creating synergistic antioxidant effects.
SS-31
SynergisticBoth protect mitochondria; different mechanisms complement each other.
BPC-157
CompatibleNo known negative interactions.
Timeline
Typical week-by-week effects reported in clinical and observational data.
- Immediately
Antioxidant activity begins
- Days-Week 1
Improved energy and well-being may be noticed
- Week 2-4
Cumulative detoxification benefits
- Week 4-12
Full benefits for skin, immunity, and cellular health
Safety
Reported adverse effects, contraindications, and what to monitor on cycle.
Common side effects
- Injection site reactions
- Mild nausea (usually with higher doses)
- Abdominal cramping
Rare side effects
- Allergic reactions
- Zinc depletion with long-term use
- Skin lightening (with high doses)
Stop signs — stop and seek advice
- Signs of allergic reaction (rash, difficulty breathing)
- Severe abdominal pain
- Signs of zinc deficiency
Contraindications
- Known allergy to glutathione
- Pregnancy or breastfeeding (insufficient safety data)
- Asthma (may trigger bronchospasm in some)
Monitoring
- Consider zinc supplementation with long-term use
- IV administration requires clinical supervision
Quality checks
What a legitimate product looks like, what should give pause, and what should make you stop.
Good signs
- White to off-white lyophilized powder
- Clear solution after reconstitution
- Reduced (not oxidized) form
- Intact vacuum seal
Warning signs
- Slight yellowing may indicate oxidation
Stop signs — don't use
- Dark yellow or brown coloration
- Cloudy solution
- Strong sulfur odor (beyond mild)
Recent research
Newer papers and trial readouts on file for this compound, with source and date.
October 2024 · Journal of Cosmetic Dermatology
Glutathione as a skin-lightening agent and in melasma: a systematic review
Systematic review of 5 RCTs found oral glutathione at 250-500mg showed significant melanin index reduction vs placebo. Topical formulations also effective. IV use lacks standardized protocols.
May 2022 · Antioxidants
Randomized Clinical Trial of How Long-Term Glutathione Supplementation Offers Protection from Oxidative Damage and Improves HbA1c in Elderly Type 2 Diabetic Patients
Long-term oral glutathione supplementation in elderly type 2 diabetic patients significantly increased blood GSH levels, decreased 8-OHdG oxidative damage marker, and improved HbA1c within three months.
References
Primary literature and clinical-trial data informing this entry.
Randomized, double-blind, pilot evaluation of intravenous glutathione in Parkinson's disease
Hauser 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.
Liposomal Glutathione Supplementation Restores TH1 Cytokine Response to Mycobacterium tuberculosis Infection in HIV-Infected Individuals
Ly 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.
Exploring the Safety and Efficacy of Glutathione Supplementation for Skin Lightening: A Narrative Review
Various · 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.
Glutathione metabolism and its implications for health
Wu 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.
Last updated . How this page was sourced is described in the methodology.