Where to buy Glutathione (also sold as GSH, L-Glutathione reduced): the 8 vendors below are the ones we have a dated product-page price for, ranked on documentation first and price second. Nothing here is typed from memory — every number links to a date.
Research use only. Compound Review scores vendors on documentation — laboratory certificates, lot records, pricing and company identity. Nothing on this page is guidance on human or veterinary use, dosing or health outcomes.
Reference size 600mg — the size most of these vendors sell. Other sizes we have on record are listed per vendor.
| # | Vendor | Rubric | 600mg price | Other sizes | Trustpilot | Buy |
|---|---|---|---|---|---|---|
| 1 | Peptide GiantsPartner Janoshik Analytical · Vanguard Laboratory | 10/10 | not sold at 600mg | 500mg $30.00 · 1500mg $48.00 | 4.6 (65 reviews) | health 10% off |
| 2 | Rivn PeptidesPartner Freedom Diagnostics | 9/10 | $29.99 ($0.05/mg · 23 Sept 2026 · list price; sold as 'GLUTATHIONE 600MG: Research Grade Peptide') | — | 4.9 (634 reviews) | compoundreview15 15% off |
| 3 | TrustedPepsPartner Freedom Diagnostics (on certificates) | 9/10 | $20.00 ($0.03/mg · 23 Sept 2026 · sale; list $30.00 struck; sold as 'Glutathione 600MG') | — | 4.8 (104 reviews) | HEALTH 10% off every order |
| 4 | PS PeptidesPartner North American Diagnostics | 8/10 | not sold at 600mg | 500mg $29.99 · 1500mg $69.99 | 4.3 (204 reviews) | HEALTH 10% off |
| 5 | Everest Peptides Freedom Diagnostics | 8/10 | not sold at 600mg | 1500mg $59.99 | 4.8 (58 reviews) | Visit |
| 6 | Puratek PeptidesPartner ILS Laboratories (on certificates) · page credits Freedom Diagnostics | 7/10 | not sold at 600mg | 1500mg $51.95 | profile removed | Visit |
| 7 | Modern AminosPartner Freedom Diagnostics (on certificate) · Kovera · Vanguard · Chromate · TrustPointe (claimed) | 7/10 | $54.00 ($0.09/mg · 23 Sept 2026 · list price; lyophilized) | 4000mg $69.00 | profile removed | Visit $30 off via our link |
| 8 | Licensed PeptidesPartner Vanguard Laboratory (printed 'Vangaurd' on COA panels) | 5/10 | $91.99 ($0.15/mg · 23 Sept 2026 · list price; 600mg; sold as 'Glutathione 600mg') | — | profile removed | Affiliate5 5% off |
Glutathione is a tripeptide that most research-peptide vendors stock, but it sits apart from the rest of their catalog: it is a bulk biochemical rather than a custom-synthesised peptide, it is sold in vial sizes measured in hundreds or thousands of milligrams, and it is priced accordingly. A per-milligram comparison against other compounds on this site is meaningless; a per-milligram comparison between glutathione vendors is what this page does.
The form matters. Research vendors sell reduced glutathione (GSH) as a lyophilised powder for reconstitution; the oxidised form (GSSG) is a different molecule, and glutathione oxidises readily once in solution. A certificate should state the reduced form and a purity figure; purity figures for glutathione tend to run lower than for synthetic peptides, and a vendor that reports an honest lower figure has told you more than one that reports nothing.
Sizes vary widely between vendors, so the reference size for ordering is the one most vendors carry, and each vendor's row lists every size we have a dated price for.
What we can verify
Names Janoshik Analytical and Vanguard Laboratory; certificates resolve on the lab's own domain (verify.janoshik.com). Product pages list dated batch codes for previous certificates, no account required. Legal entity, Tampa, FL address, EIN and sales-tax number published: Plainview Commerce LLC. Full basket with sized pricing, stable across reads.
Net content: Vanguard Laboratory PDF for lot PG-5101 (TB-500 5mg) reports 4.92mg measured vs 5mg, 99.30% purity — read 6 Sep 2026
Where it falls short
Small review base (65 on Trustpilot, 26 Sep 2026). Measured net content could not be read from the certificate images. The legal entity name appears on the refund policy but not the About page. GLP products sold under house codes PG-1SG / PG-2TZ / PG-3RT.
What we can verify
Names Freedom Diagnostics (Nashville) as its per-batch testing lab — the same laboratory Purgo Labs uses. 43-product catalog with public sized pricing. 4.9 across 561 Trustpilot reviews on a claimed, active profile (read 19 Sep 2026). Free same-day shipping (order by 12pm CT), 30-day money-back, published street address in Gallatin, TN.
Net content: Certificate reports 1.19mg measured vs 1mg label, 99.76% purity
Where it falls short
Scored 10/10 on 19 Sep 2026, up from 8/10, and the timing is disclosed rather than buried: Rivn became an affiliate partner the same day, and that is what prompted the re-read. The two points it had been missing came from a single on-site '4.9 (1,247 reviews)' widget that contradicted the real Trustpilot record; that widget is gone, no in-house review count replaced it, and a searchable 47-certificate library now sits where seven loose images were in August. Full evidence and the exact pages checked are in the score history. Still vendor-stated and unverified: 'ISO 9001 certified facilities', 'Certified GMP', and the lab's ISO/IEC 17025 accreditation — claims we note but do not score.
What we can verify
4.7 across 90 Trustpilot reviews. Certificate images with batch codes viewable without an account. Sized pricing (BPC-157 10mg $30.00).
Net content: Certificate reports Net Peptide Content 10.50mg vs 10mg label, 98.509% purity (lot TPBP32826)
Where it falls short
The lab (Freedom Diagnostics) appears only on the certificate image, never in page text; the certificate carries a lab search code (Trus2604010178) and reports 10.50mg vs 10mg label. No legal entity and no address on About, Contact or Terms — 'Location: United States' only. Weight-loss compounds sold as 'TP-TZ' and 'TP-RT' with the identity never stated; those prices are excluded from our index. Domain under a year old.
Before you order, check the batch
A ranking tells you which vendors have good practices; it cannot tell you about the specific vial you receive. When your order arrives, compare the batch number on the label to the certificate. If they do not match, or there is no batch number, the documentation does not cover what you were sent, regardless of who you bought from. How to read a peptide COA.
As of 23 Sept 2026, 8 of the 78 vendors on our scoreboard list Glutathione with a price we have read on the product page: Peptide Giants, Rivn Peptides, TrustedPeps, PS Peptides, Everest Peptides, Puratek Peptides, Modern Aminos, Licensed Peptides. Every one of them is scored on the same 10-point rubric; the table above shows the score, the dated price and what you can verify before ordering.
At the 600mg size, the lowest price we have on record is TrustedPeps at $20.00 (read 23 Sept 2026) — sale; list $30.00 struck; sold as 'Glutathione 600MG'. It scores 9/10 on documentation. Price is the second sort key on this page, not the first, because an underdosed vial at a low price is the most expensive outcome.
Peptide Giants leads at 10/10: named laboratory, certificates that resolve on the laboratory's own site, measured milligrams against the label, and a published legal identity. The per-criterion evidence, with dates, is on each vendor's review page.
Glutathione is sold by these vendors as a research chemical for laboratory use, not for human consumption; none of it is FDA-approved in this form. Legality of purchase varies by jurisdiction and the compound, and it is your responsibility to know your local rules. Our pages assess documentation and pricing; they are not legal or medical advice.
Rubric score first. Among equal scores, the lower verified price per milligram at 600mg. Then the larger independent review base. Affiliate partnership is not an input: 7 of the 8 vendors here are partners and they sit wherever the evidence puts them.
Reduced glutathione (GSH) is the active form vendors sell; oxidised glutathione (GSSG) is two GSH molecules joined by a disulfide bond. GSH converts to GSSG on exposure to air, which is why it is sold lyophilised and why a certificate's purity figure for GSH is worth reading rather than assuming.
It is a bulk-manufactured biochemical rather than a stepwise-synthesised peptide, and it oxidises easily, so an HPLC run often shows some oxidised material. A vendor whose certificate states the actual figure is being more transparent than one whose product page says only '99%'.