Where to buy glutathione.

You can buy glutathione three ways: as an oral supplement off the shelf, as research-supply powder online, or as a compounded IV preparation on a prescription. All three are genuinely open, which is unusual here. Where to buy glutathione matters less than which form arrives, because two different molecules share the name.

Glutathione

Referenced in this guide

Batch-matched COAHPLC + mass specResearch use only

The Glutathione referenced throughout this article, supplied as a research compound with a certificate of analysis matched to the lot you receive — the check this site argues you should hold any supplier to.

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We answer three sourcing questions below. Which channel to use, which form to verify on the Certificate of Analysis, and how glutathione compares to its precursor NAC.

Where can you buy glutathione?

Glutathione reaches buyers through three genuinely open channels. An oral dietary supplement off the shelf, research-supply powder online, and a compounded sterile IV preparation on a prescription. Each has different products, rules and gaps.

• Oral supplement, off the shelf: No prescription. Sold under US supplement law. The gut breaks most of it down before it reaches your bloodstream.
• Research supply, online: $30-$60 per gram bulk. Best documentation of the three. Laboratory-use labeling only.
• Compounded IV, on a prescription: $150-$400 per session at a clinic. The only route with full bioavailability, and the only one carrying formal FDA warnings.

1. Prescription / compounded IV

Compounding pharmacies operating under 503A rules can prepare sterile injectable glutathione. Those rules are the part of US drug-compounding law that lets a pharmacy prepare custom doses for a named patient with a prescription.

A doctor writes the prescription and the pharmacy mixes and ships. IV-therapy clinics bundle the prescription, the compounding and the infusion into one $150-$400 session.

What this channel doesn't give you is FDA approval for any indication. Nor controlled-trial efficacy data for the marketed uses: skin whitening, "detox", senescence. Nor any resolution of the Philippines FDA and US FDA warning letters aimed at unapproved IV glutathione products.

2. Dietary supplement (oral)

Oral glutathione is sold as a dietary supplement in the US under DSHEA. That's the 1994 law letting companies sell supplements without FDA pre-approval, so long as they don't claim to treat disease. Liposomal formulations, meaning GSH wrapped in lipid spheres to survive the gut, compete on the same shelf.

What this channel doesn't solve is the gut-hydrolysis problem. Most oral GSH is broken down by gamma-glutamyltransferase before it reaches your bloodstream. Liposomal formulations partly mitigate that, and the comparative pharmacokinetic data stays thin.

3. Research-supply (laboratory use only)

Research-supply vendors sell glutathione as a reference compound labeled "for laboratory research use only." It's the same molecule used in published antioxidant assays and redox studies. Pricing reflects fermentation economics rather than synthesis cost, and CoA quality is usually most rigorous at this tier.

What this channel doesn't give you is any human-use indication. The label restricts material to laboratory work. Research-supply GSH is legal to buy and sell as a reference compound, bounded by that scope.

Which research-supply vendors to shortlist

Five vendors inside the research-supply channel, ordered the way our supplier comparison orders them — on what each one will show you rather than what it claims — with every column pulled from the vendor's own storefront on 13 August 2026; there is no verified glutathione price anywhere in that set, so pricing is benchmarked on BPC-157 across the same vendors and no price column appears here.

Only the first two name their testing lab in their own site copy; on the other three you have to open the PDF and read the letterhead. Stock varies by compound, so confirm a vendor actually lists glutathione before you compare — what these columns describe is disclosure practice, and that is the part that travels across every compound a vendor sells. Disclosure: this site earns a commission on purchases made through its links, and Peptriva is one of the vendors it links to. Every column above is a document you can open or a page you can load yourself.

The identity check to run against whichever vendor you pick is the CAS number on the certificate, because two of them are in circulation for this compound: 70-18-8 is reduced glutathione (GSH), and 27025-41-8 is the oxidized dimer (GSSG) — a different molecule sold under the same shelf name.

What is glutathione, exactly?

Glutathione is a three-residue peptide, structure γ-L-glutamyl-L-cysteinyl-glycine. The unusual gamma-carboxyl link on glutamate makes it resistant to most peptidases, though not to the gut enzyme that breaks it down.

The biological work is done by the cysteine thiol group. That's what scavenges reactive oxygen species and serves as a cofactor for the glutathione peroxidase enzyme family.

The 2009 Forman review in Molecular Aspects of Medicine is the canonical reference for GSH biology. The 2013 Lu review covers the biosynthetic pathway.

Unlike most research peptides, glutathione is made by industrial microbial fermentation rather than solid-phase synthesis. That's why bulk material is among the cheapest reference compounds per milligram you'll see. Reduced GSH oxidizes to the GSSG dimer on contact with air or moisture, so credible material ships freeze-dried in light-protected packaging.

How does glutathione bioavailability differ by route?

Glutathione bioavailability is low by mouth, moderate in liposomal form, and complete by IV. The three routes differ sharply in how much intact tripeptide reaches your bloodstream:

• Oral GSH: mostly hydrolyzed by gut gamma-glutamyltransferase before absorption. Very little intact tripeptide reaches plasma.
• Liposomal GSH: reduced GSH wrapped in lipid vesicles to protect it through the gut. The mechanism is plausible. Published comparative PK data is thinner than the marketing implies.
• IV GSH: bypasses gut hydrolysis entirely. This is the route used in skin-whitening clinic protocols at 600-1,200 mg doses. It's also the route with the regulatory warnings.

The 2025 Zhang PK study measured oral NAC bioavailability in chickens at 17-22%. Similar limits apply in humans, which is why oral NAC doses run high at 600-1,200 mg/day.

Studies have investigated NAC in preference to direct oral glutathione because cysteine is the rate-limiting building block. Supplying the precursor lets cells build GSH themselves, rather than relying on intact tripeptide crossing a peptidase-rich gut.

Why did regulators warn about IV glutathione?

Regulators warned about IV glutathione because of documented serious adverse events, including deaths. It's the most consequential fact about glutathione sourcing, and the one the cosmetic-medicine market doesn't advertize.

The Philippines FDA issued an initial advisory in 2011 and reissued it multiple times since. The reports they cite include:

• Stevens-Johnson syndrome and toxic epidermal necrolysis (severe skin reactions where the outer layer separates from the body underneath).
• Hepatotoxicity (liver damage) and nephrotoxicity (kidney damage).
• Anaphylactic reactions (severe allergic responses).
• Loss of skin barrier function.
• Reported deaths.

The US FDA has issued warning letters against unapproved IV glutathione products, particularly when marketed for skin whitening.

The strongest controlled human evidence for glutathione skin lightening is the 2021 Wahab RCT in International Journal of Dermatology. It randomized 46 participants to combined topical-plus-oral GSH versus monotherapy.

The combination arm showed lightening on the melanin index and the L* skin-lightness scale. We'd call that modest evidence for topical and oral routes. It doesn't support the leap to IV that the cosmetic market has made.

What does glutathione cost in 2026?

Glutathione costs $30-$60 per gram in bulk, $60-$80 per 1,500 mg research vial, and $150-$400 per IV-clinic session. It's made at industrial scale by fermentation rather than built residue-by-residue, which collapses the per-milligram cost. The 2026 benchmarks by channel:

• Bulk third-party tested reduced GSH: $30-$60 per gram. Fermentation economics. Appropriate for in-vitro cellular assays.
• 1,500 mg research vials, higher-purity tier: $60-$80 per vial. Lyophilized reduced GSH, ≥99% HPLC purity, third-party CoA per lot.
• IV-clinic infusions: $150-$400 per session for 600-1,200 mg dosing. Actual material cost is roughly $20-$60. The rest is clinic markup: IV bag, nursing labor, overhead, profit.

Glutathione priced above $80 per gram reflects retail markup, not synthesis cost. Below $20 per gram from an unknown source, we'd want verification. The question is whether the vial holds reduced GSH at ≥99% purity, oxidized GSSG, or a partly degraded preparation.

What is the difference between GSH and GSSG?

Two molecules go by the name "glutathione" on different labels, and they're not interchangeable. Reduced GSH is the active antioxidant. Oxidized GSSG is the spent dimer, useful as a reference standard and wrong for an antioxidant assay.

Reduced GSH has MW 307.32 and CAS 70-18-8. It's the biologically active form, carrying the free cysteine thiol that does the redox work.

Oxidized GSSG has MW 612.63 and CAS 27025-41-8. It's the dimer formed when two GSH molecules join through a disulfide bond. GSSG works as a reference standard for measuring the cellular GSH/GSSG ratio. It isn't the right compound for antioxidant or detoxification assays.

A CoA that lists "glutathione" without specifying reduced or oxidized is a critical gap. Don't accept it.

The unambiguous discriminator is mass-spec. An observed [M+H]⁺ at 308.1 confirms reduced GSH. An observed mass at 612.6 means the vial is GSSG. Ask for the trace.

What are the red flags when buying glutathione?

The glutathione red flag we weigh heaviest is a CoA that says "glutathione" without saying reduced or oxidized. Five more:

• Form not designated. Reduced GSH (MW 307.32) and oxidized GSSG (MW 612.63) are different molecules. A CoA without an explicit form designation is a critical gap.
• IV protocols marketed for skin whitening. This is the route with the Philippines FDA formal warning and US FDA warning letters. Documented Stevens-Johnson syndrome, hepatotoxicity, anaphylaxis, and reported deaths.
• Pre-reconstituted liquid GSH at room temperature. Reduced GSH oxidizes to GSSG in solution. The lyophilized form is what ships stably.
• "Injectable glutathione" without sterility documentation. Parenteral preparations require sterility, isotonicity, and pH control that grey-market manufacturing may not meet.
• Clinical skin-whitening claims on the product page. Vendors making these claims with IV protocols have crossed into FDA jurisdiction.
• Missing CAS 70-18-8, or mass-spec not matching 308.1. Wrong identity line, wrong mass: wrong molecule.

Glutathione

1,500 mg ≥99% pure Lyophilized

Reduced active form (GSH), CAS 70-18-8. The reference compound for cellular antioxidant assays, the GSH/GSSG redox-ratio biomarker, and the tyrosinase-inhibition mechanism cited in the Wahab 2021 RCT. COA with HPLC trace and mass-spec ships with every order.

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Frequently asked questions.

Is glutathione legal to buy?

Reduced GSH is legal to buy and sell as a research reference compound. It's also legal as an oral dietary supplement under DSHEA. IV glutathione has no FDA approval for any indication. The US FDA has issued warning letters against unapproved IV GSH products. The Philippines FDA has issued formal advisories against IV GSH for skin whitening.

How does IV glutathione bioavailability compare to oral?

Glutathione bioavailability differs sharply by route. Oral GSH is largely hydrolyzed by gut gamma-glutamyltransferase before absorption. Liposomal GSH modestly improves on that, though comparative PK data is limited.

IV bypasses gut hydrolysis entirely. It's also the route against which the US FDA and Philippines FDA have issued formal warnings. Research into raising intracellular GSH has noted that NAC, the cysteine precursor, carries established oral pharmacokinetics and FDA-approved indications elsewhere.

What does the research literature report on glutathione and skin pigmentation?

The tyrosinase-inhibition mechanism for glutathione is documented in the biochemical literature. The 2021 Wahab RCT, n=46, reported significant lightening on melanin index and L* score for the combined topical-plus-oral arm versus monotherapy. We'd read that as modest controlled evidence for topical and oral routes.

The IV protocols promoted in the cosmetic market aren't supported by blinded efficacy trials at clinic doses. The Philippines FDA and US FDA have both issued formal warnings citing documented serious adverse events.

How much should third-party tested glutathione cost?

2026 pricing: $30-$60 per gram bulk, $60-$80 per 1,500 mg vial at ≥99% purity. IV-clinic sessions bill $150-$400 on $20-$60 of material. Above $80 per gram is retail markup. Below $20 per gram raises form-and-purity questions.

What should a glutathione CoA show?

HPLC purity ≥99%. Mass-spec at observed [M+H]⁺ 308.1 (MW 307.32). CAS 70-18-8 on the identity line. Explicit reduced-form (GSH) vs oxidized-form (GSSG) designation. Karl Fischer water content, residual solvents per ICH Q3C, and bacterial endotoxin testing for parenteral-grade material. ISO/IEC 17025-accredited lab named on the report.

Glutathione vs NAC: which is the appropriate research reference compound?

Glutathione and NAC are different molecules with different evidence bases. Glutathione, MW 307.32, is the tripeptide cofactor itself. N-acetylcysteine, MW 163.20, is the rate-limiting precursor.

NAC carries FDA approvals for acetaminophen overdose and as a mucolytic, and published PK studies put its oral absorption at 17–22%. For the GSH/GSSG redox cycle, glutathione is the right reference compound. For precursor supplementation, NAC has the established pharmacology.