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The body's master antioxidant — a tripeptide synthesized in every cell that governs oxidative stress, liver detoxification, and immune cell function. Injectable glutathione bypasses the gut degradation that renders oral supplementation largely ineffective, delivering reduced GSH directly for cellular uptake. Available in 600mg and 1,500mg vials for subcutaneous or IV administration.
Glutathione (GSH) is a tripeptide composed of glutamate, cysteine, and glycine. It is the most abundant intracellular antioxidant in the human body and the primary substrate for cellular detoxification. Every cell makes it; the liver makes the most of it. The problem is that synthesis declines with age, oxidative load, alcohol consumption, chronic illness, poor nutrition, and intensive exercise — leaving cells increasingly vulnerable to free radical damage.
Oral glutathione has notoriously poor bioavailability. The gut breaks the tripeptide bond before it can be absorbed intact; what reaches systemic circulation is primarily the constituent amino acids, which cells then use to re-synthesize GSH — a roundabout process with no guarantee of net cellular delivery. Injectable glutathione eliminates that problem entirely. IV or subcutaneous administration delivers reduced GSH into the bloodstream directly, where it is taken up by tissues that need it most.
The applications are broad: liver support during alcohol recovery or detoxification, oxidative stress reduction in high-training athletes, immune amplification via natural killer cell enhancement, skin brightening via melanin pathway inhibition, and NAD+ conservation by reducing the recycling burden on antioxidant systems.
The liver is the primary site of glutathione synthesis and consumption. GSH conjugation (Phase II detox) is required to neutralize hundreds of compounds — drugs, alcohol metabolites, environmental toxins. Injectable GSH replenishes hepatic stores under load, supporting enzymatic detox capacity.
GSH donates electrons to neutralize hydrogen peroxide and lipid peroxides via glutathione peroxidase. In intensive training, illness, or metabolic dysfunction, the demand for GSH recycling exceeds synthesis. Injectable delivery restores the redox buffer before cellular damage accumulates.
Mitochondria generate ATP and produce reactive oxygen species as a byproduct. Mitochondrial GSH (mGSH) is the organelle's primary defense against ROS-induced damage. Depletion of mGSH is associated with accelerated cell aging and dysfunction. Injectable GSH supports mGSH replenishment.
Natural killer (NK) cells and T lymphocytes require intracellular GSH for proliferation and cytotoxic function. Lymphocytes with depleted GSH have impaired antigen response. Injectable GSH has been studied in HIV and chronic infection populations specifically for immune restoration.
GSH inhibits tyrosinase, the rate-limiting enzyme in melanin synthesis. High-dose IV glutathione protocols are widely used in dermatology for skin brightening and hyperpigmentation treatment. Effect is reversible upon cessation — pigmentation returns to baseline over time.
Several NAD+-consuming enzymes (including PARP and SIRT1 regulators) are activated in response to oxidative stress. By reducing oxidative load, adequate GSH levels decrease NAD+ consumption in stress-response pathways — effectively preserving NAD+ for metabolic and longevity-related functions.
Intracellular GSH levels fall roughly 30% between young adulthood and age 60 across most tissues, particularly in the liver and brain — driving increased oxidative vulnerability.
Studies measuring plasma GSH after oral dosing consistently find minimal elevation. Injectable routes achieve near-complete systemic delivery of the intact reduced tripeptide.
600mg SC 2–3x/week is common for general antioxidant support. 1,500mg IV push is the clinical standard in detoxification and dermatology protocols.
Glutathione can be administered subcutaneously (slow absorption, convenient) or intravenously (immediate peak, clinic or home IV setting). Reconstitute lyophilized vials with bacteriostatic water. SC injection sites: abdomen, outer thigh. IV push: dilute in saline and infuse over 10–15 minutes to reduce risk of transient flushing.
| Protocol | Dose | Frequency | Notes |
|---|---|---|---|
| Maintenance SC | 600mg SC | 2–3x per week | General antioxidant support and oxidative stress management. Well-tolerated subcutaneous protocol for ongoing use. |
| Intensive IV | 1,500mg IV | 1–2x per week | Clinic or home IV setting. Standard for liver support, skin protocols, and post-illness recovery. Infuse over 10–15 minutes. |
| Recovery / Acute | 1,500mg IV | Daily × 5–7 days | Short-course aggressive repletion after significant oxidative events (illness, surgery, heavy alcohol, intensive training block). |
| Cycle length | — | — | No known receptor desensitization. Many researchers use ongoing maintenance protocols rather than cycles. Labs (GSH-Px activity, LFTs) can guide duration. |
Glutathione stacks well with compounds that share antioxidant, mitochondrial, or immune-support research angles. It is also commonly included in broader longevity and performance protocols where oxidative load is a concern.
600mg and 1,500mg vials available. Finnrick-verified purity, lot-specific COA, ships in 24 hours.
Begin Protocol Intake View All ProtocolsMedical Disclaimer: The information on this page is for educational purposes only and does not constitute medical advice. All protocols require evaluation and prescription by a licensed physician. You should consult a qualified healthcare provider before starting any new medical protocol. Individual results vary. Cinch Bio is not a pharmacy and does not dispense medications — all prescriptions are issued by independent licensed physicians and filled by licensed 503A compounding pharmacies.