Glutathione

Human clinical Anti-Aging & Longevity 3 sources

Glutathione is a powerful tripeptide naturally produced in the body, acting as the 'master antioxidant'. Research shows it plays a critical role in neutralizing free radicals, detoxifying harmful compounds, and supporting immune function. Studies are exploring its benefits for skin health, liver function, and mitigating age-related oxidative stress.

01Dosing reference

Amount

200-600 mg/day (SubQ/IM) or 500-1000 mg (Liposomal Oral)

Frequency

1-3x/week for injections, daily for oral

Cycle

Ongoing or 8-12 weeks for specific protocols

Reference figures, not a recommendationThese values reflect amounts described in the literature and vendor documentation this database indexes. Use the reconstitution calculator to convert them into syringe units.

02Mechanism of action

Antioxidant defense system

Glutathione acts as an electron donor, directly neutralizing reactive oxygen species (ROS) and free radicals.

Cellular protection and detoxification

It prevents cellular damage, supports the regeneration of other antioxidants like vitamins C and E, and conjugates with toxins in the liver for excretion.

Research implication

Enhancing glutathione levels may mitigate age-related cellular damage, improve metabolic health, and support immune resilience.

03Human evidence

Oral and sublingual glutathione supplementation can increase body stores of glutathione and reduce oxidative stress markers.

Randomized controlled trials in healthy adults, though standard oral bioavailability has historically been debated.

Intravenous (IV) and topical glutathione show potential in improving skin elasticity and reducing melanin production.

Clinical studies in dermatology, though long-term safety of high-dose IV use for cosmetic purposes requires more research.

04Preclinical evidence

Glutathione depletion accelerates cellular aging and increases susceptibility to oxidative damage.

In vitro and animal models of aging and neurodegeneration.

Liposomal glutathione formulations demonstrate enhanced cellular uptake compared to standard aqueous solutions.

Pharmacokinetic studies in animal models.

05What is known vs. unknown

Reasonably established

It is the body's 'master antioxidant,' essential for cellular defense against oxidative stress.
Levels naturally decline with age, poor diet, stress, and environmental toxin exposure.
It plays a vital role in phase II liver detoxification processes.
Delivery methods (IV, liposomal, sublingual, SubQ) significantly impact its bioavailability compared to standard oral capsules.

Unknowns & limits

The optimal dosing and delivery method for specific therapeutic outcomes (e.g., anti-aging vs. liver support) remain under investigation.
Long-term safety of high-dose IV glutathione, particularly for cosmetic skin lightening, is not fully established.

06Safety & regulatory context

Regulatory statusGlutathione is generally considered safe when taken orally, sublingually, or via standard injection routes at appropriate doses. It is available as a dietary supplement in many countries. However, high-dose intravenous administration, especially for unapproved uses like skin lightening, has prompted warnings from regulatory agencies like the FDA due to potential adverse effects, including liver toxicity, kidney damage, and severe skin reactions. It is contraindicated in individuals with known hypersensitivity to the compound.

07Compared with NAC (N-Acetyl Cysteine)

Glutathione vs. NAC (N-Acetyl Cysteine)

Key difference

NAC is a precursor that provides the rate-limiting amino acid (cysteine) needed for the body to synthesize its own glutathione, whereas direct glutathione supplementation provides the finished molecule.

When researchers discuss each

NAC is often discussed as a cost-effective, highly bioavailable way to boost intracellular glutathione levels, while direct glutathione (especially liposomal or IV) is discussed for immediate systemic antioxidant support.

08Glossary

Reactive Oxygen Species (ROS)

Highly reactive molecules that can cause damage to cell structures if not neutralized by antioxidants.

Bioavailability

The proportion of a substance that enters the circulation when introduced into the body and is able to have an active effect.

Liposomal Delivery

A technology that encapsulates a nutrient in a lipid (fat) sphere to protect it from digestion and improve cellular absorption.

09Knowledge check

Q1Why is N-Acetyl Cysteine (NAC) often used in conjunction with or instead of standard oral glutathione?

Q2What is the primary biological role of glutathione in the body?

Q3When interpreting randomized trials that report increased glutathione after oral supplementation, which documented limitation from the dossier is most important to consider?

Q4According to the dossier, how do researchers typically distinguish NAC (N‑Acetyl Cysteine) from direct glutathione supplementation in discussions of boosting glutathione?

Q5Which safety or regulatory concern about glutathione use is explicitly mentioned in the dossier?

10Sources

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1-3 mg/day (theoretical research dose)

Research and educational use onlyNothing on this site is medical advice, a prescription, or a recommendation for human use. Compounds documented here are research chemicals. Consult a qualified clinician before making any health decision.