Glutathione Dosagem: IV, Injectable & Strips (2026)

Oral glutathione is mostly destroyed in the gut -- three delivery routes that actually work, with protocols for each.

Community glutathione protocols run 200-600 mg by intramuscular or subcutaneous injection 2-3x/week, or 600-2,000 mg by IV infusion weekly to biweekly. Injectable and IV routes dominate because standard oral glutathione has very low bioavailability — it's largely degraded in the gut before reaching circulation.

Research-context information only. Glutathione is a research peptide. Protocols, doses, and reactions reported below come from published research and self-reported community sources. This article reports what has been documented, not what should be done. Consult a licensed physician for personal medical decisions.

Glutathione is the body's master antioxidant tripeptide (glutamate-cysteine-glycine). Below: injectable, IV, and buccal protocols with documented dose ranges, delivery-route trade-offs, and reconstitution math — for the full mechanism and age-decline research, see the glutathione peptide page .

Glutathione Dosing Table

Match your vial size below — reconstitution and dose math update automatically.

Math assumes U-100 insulin syringes (1 mL = 100 units). Verify your syringe matches before injecting. Round half-units to the nearest visible mark.

Math assumes U-100 insulin syringes (1 mL = 100 units). Verify your syringe matches before injecting. Round half-units to the nearest visible mark.

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Quick Reference: Injectable Protocol

Community-reported starting doses cluster around 200 mg 2-3 times per week, with functional medicine protocols describing doses up to 600 mg per session.

Injectable Protocol (IM/SubQ)

Intramuscular and subcutaneous glutathione injections are the most common non-IV route documented in functional medicine literature. Pre-mixed injectable glutathione is available from compounding pharmacies, and lyophilized powder requires reconstitution with bacteriostatic water before use.

Documented dose ranges:

Route notes: Intramuscular injection (deltoid, gluteal) is the most commonly cited route in community protocols. Subcutaneous injection (abdominal fat pad) is also documented. IM administration provides faster absorption; SubQ delivers a slower, more sustained release profile.

Reconstitution (lyophilized powder): Protocols describe adding bacteriostatic water to lyophilized glutathione vials according to manufacturer instructions. The resulting solution is typically drawn into an insulin syringe or standard IM syringe depending on volume.

IV Infusion Protocol

Intravenous glutathione delivers the highest peak plasma levels of any route. Published pharmacokinetic data from Aebi et al. (1991) documented that IV infusion of 2 g/m^2 raised plasma glutathione from 17.5 umol/L to 823 umol/L -- a roughly 47-fold increase -- with a half-life of approximately 14 minutes ( Aebi et al., 1991 ).

Documented IV protocols:

Vitamin C pairing: IV glutathione is frequently administered alongside IV vitamin C (ascorbic acid) in functional medicine settings. Vitamin C acts as a glutathione recycler, regenerating the reduced (active) form from the oxidized form. Published protocols describe 1000-5000 mg vitamin C co-infused with glutathione.

Practical considerations: IV administration requires clinical supervision. The short plasma half-life (~14 minutes) means peak levels are transient, which is why weekly or biweekly protocols are common in clinical practice.

Buccal Strip Protocol

Orobuccal (sublingual/buccal) glutathione formulations bypass intestinal degradation entirely by absorbing through the oral mucosa directly into the bloodstream. Published research documented measurable blood glutathione elevation within 30-60 minutes of buccal administration ( Buonocore et al., 2015 ).

Documented buccal protocols:

Buccal strips offer a practical middle ground: bioavailability meaningfully higher than oral capsules, without requiring injection. Community reports describe this route as the preferred non-injectable option for daily glutathione maintenance.

Oral Supplementation (Limitations)

Standard oral glutathione capsules face a well-documented bioavailability problem. The enzyme gamma-glutamyltransferase (GGT) in the intestinal lining breaks the glutathione tripeptide into its component amino acids before it reaches systemic circulation.

Liposomal glutathione is the notable exception. Liposomal encapsulation protects the molecule from GGT degradation. Sinha et al. (2018) documented that liposomal glutathione supplementation at 500-1000 mg daily elevated blood glutathione stores over 1-6 months in healthy adults ( Sinha et al., 2018 ).

NAC (N-acetylcysteine) as precursor: Rather than supplementing glutathione directly, NAC provides the rate-limiting amino acid (cysteine) for endogenous glutathione synthesis. Oral NAC at 600-1800 mg daily is well-absorbed and documented to raise intracellular glutathione levels over weeks of use. Published research compares NAC, oral glutathione, and sublingual glutathione head-to-head ( Schmitt et al., 2015 ).

Standard oral glutathione: A randomized controlled trial by Richie et al. (2015) documented that oral glutathione at 250-1000 mg daily for 6 months did increase blood, erythrocyte, and lymphocyte glutathione levels, though the magnitude of increase was smaller than injectable or IV routes ( Richie et al., 2015 ).

Why Standard Oral Glutathione Fails

This section explains the pharmacokinetic barrier that makes injectable, IV, and buccal routes necessary for meaningful glutathione repletion.

The GGT problem: Gamma-glutamyltransferase (GGT) is an enzyme concentrated in the intestinal brush border that cleaves the gamma-glutamyl bond in glutathione. This breaks the tripeptide into glutamate, cysteine, and glycine before absorption. The individual amino acids are absorbed and can be used to resynthesize glutathione intracellularly, but this is a slow, rate-limited process that does not produce the acute plasma elevation seen with parenteral routes.

First-pass metabolism: Even glutathione that survives GGT faces hepatic first-pass metabolism. The liver extracts and metabolizes glutathione efficiently, further reducing systemic bioavailability from the oral route.

The practical implication: Published pharmacokinetic comparisons show that IV glutathione produces a ~47-fold plasma elevation within minutes, while standard oral capsules produce minimal measurable change. This gap is why clinical protocols for acute glutathione repletion -- liver support, immune challenges, detoxification -- consistently use parenteral routes rather than oral supplementation.

Cycling

Glutathione is endogenous -- the body produces it continuously in every cell. Most documented protocols treat glutathione supplementation as a maintenance intervention rather than a cycled compound.

Injectable protocols: Community sources describe continuous 2-3x/week injection schedules without cycling. Some users run 8-12 week injectable courses and bridge with oral precursors (NAC or liposomal glutathione) during off periods, though this appears to be a cost management strategy rather than a physiological requirement.

IV protocols: Clinic-based IV glutathione is typically administered on an ongoing schedule (weekly or biweekly) as long as the clinical indication persists. Published Parkinson's research used 3x/week IV infusions for defined study periods.

Oral/buccal protocols: Continuous daily use is the standard documented approach for oral and buccal routes.

Stacking Protocols

NAD+ synergy: Glutathione and NAD+ operate in complementary antioxidant pathways. NAD+ supports sirtuin-mediated stress response and mitochondrial function, while glutathione handles direct free radical neutralization and Phase II detoxification. Community protocols commonly pair injectable glutathione (200-400 mg, 2-3x/week) with injectable NAD+ (100 mg, 2-3x/week).

Side Effects and Safety

Published clinical literature describes glutathione as well-tolerated across all delivery routes.

• IV infusion: Occasional mild nausea, flushing, or headache during rapid infusion; slower rates reduce incidence
• Injectable (IM/SubQ): Standard injection site reactions (mild pain, redness) consistent with other injectable peptides
• Buccal/sublingual: Minimal reported adverse effects in published studies
• Skin lightening: Documented in clinical trials at higher doses. A systematic review found that both oral (500 mg/day) and IV glutathione reduced melanin index in sun-exposed skin areas ( Dilokthornsakul et al., 2019 ). Some users seek this effect intentionally; others consider it an unwanted side effect
• Zinc depletion (theoretical): High-dose glutathione may chelate zinc over extended use; periodic mineral panels are documented in some functional medicine protocols
• Drug interactions: Glutathione may affect the metabolism of certain chemotherapy drugs (it is studied in this context); individuals on medication should consult their prescriber

Frequently Asked Questions

Related Guides

• NAD+ Dosing Guide -- Multi-route protocol for another endogenous molecule with age-related decline
• GHK-Cu Dosing Guide -- Longevity stacking partner for tissue repair and antioxidant defense
• Best Peptides for Longevity -- Where glutathione fits in the longevity peptide landscape

References

For educational and research purposes only. This is not medical advice. Glutathione is an endogenous molecule; exogenous supplementation protocols described above come from published research and community sources.

Tabelas de referência

Perguntas frequentes

What doses do clinical studies and community sources report for glutathione injections?

Community-reported injectable protocols typically use 200-600 mg intramuscularly 2-3 times per week; some functional medicine clinical reports describe doses up to 600 mg per session. IV infusion protocols in published research have used 600-2000 mg per session, administered weekly or biweekly under clinical supervision.

What is the difference between oral and injectable glutathione bioavailability?

Standard oral glutathione has very low bioavailability due to enzymatic degradation by gamma-glutamyltransferase in the gut. Published pharmacokinetic data show IV glutathione raises plasma levels approximately 47-fold above baseline, while standard oral forms produce minimal measurable increases.

What cycling protocols are documented for glutathione?

Most documented protocols treat glutathione as a continuous supplement rather than a cycled compound, since it is an endogenous molecule the body produces naturally. Some community protocols describe 8-12 week injectable courses followed by oral precursor maintenance.

What side effects are reported in glutathione clinical literature?

Published research describes glutathione as generally well-tolerated across routes. IV infusion studies report occasional mild nausea, flushing, or injection site discomfort. Skin lightening has been documented at higher doses in clinical trials, which some users seek intentionally.

What stacking protocols are documented for glutathione and NAD+?

Community protocols commonly pair glutathione with NAD+ for synergistic antioxidant and mitochondrial support. Vitamin C is frequently included as a glutathione recycler, and alpha-lipoic acid as a regenerator of both glutathione and vitamin C.

What is the documented role of buccal strips for glutathione delivery?

Orobuccal formulations bypass intestinal degradation by absorbing through the oral mucosa. Published research documented measurable blood glutathione elevation within 30-60 minutes of buccal administration, compared to minimal absorption from standard oral capsules.