Where to buy Glutathione (reduced glutathione, GSH) in the UK: the sellers with a verifiable COA
The newest verifiable Glutathione certificate on any UK seller's website is on Peptology Labs (peptologylabs.uk), analysed 7 Aug 2026 (task #217689 on Janoshik's site); 2 verified sellers hold one covering Glutathione, listed newest first below.
A record of paperwork, not a recommendation: The Peptide Watch sells nothing, takes no money from sellers and links to none of them.
Who has the newest report · Why the date matters · What purity means · What Glutathione is · Regulators · Every report
Who holds the newest Glutathione report (2 verified UK sellers)
Newest report first. Every report was opened on Janoshik's own website and names the seller as the client. The date is the analysis date printed on the report. The verify link opens the laboratory, never the shop. Audit findings, not recommendations.
| Seller | Newest Glutathione report | Age of that report | Purity on it | |
|---|---|---|---|---|
| Peptology Labs | 7 Aug 2026 | 2 months, 3 days | 99.167% | verify |
| Phoenixbiolabs | 13 May 2026 | 4 months, 27 days | 99.001% | verify |
Every Glutathione purity report we have read (2), one row per report
The 2 verifiable Glutathione certificates we have read, newest first
Each row was opened on Janoshik's own site by a real page load and transcribed. The client column is the name the laboratory printed; a certificate counts as a seller's own only when that name is the seller. The report date is the analysis date printed on the report where we have read it, otherwise the date the laboratory received the sample. The verify link opens the laboratory, never the shop. Audit findings, not recommendations.
| Seller | Task | Client on the report | Report date | Result | Batch | |
|---|---|---|---|---|---|---|
| Peptology Labs | #217689 | Peptology Labs Ltd | 7 Aug 2026 | Glutathione · 1501.98 mg · 99.167% | GL3618 | verify |
| Phoenixbiolabs | #147232 | www.phoenixbiolabs.net | 13 May 2026 | Glutathione · 1539.65 mg · 99.001% | Batch-0136 used in vials + pen(s) | verify |
Why the date on a certificate matters
What a purity figure means
The purity on a Janoshik report is the share of the main peak in an HPLC chromatogram. 99.5% means that 99.5% of what the detector saw was one substance and 0.5% was something else. It is not the amount in the vial: that is the separate quantity line, in milligrams. It does not by itself prove which substance the peak is: that is identity, confirmed by mass spectrometry. And it says nothing about sterility, endotoxins or heavy metals, which are separate tests.
A purity figure printed on a shop page with no report behind it is a claim, not a measurement. Between two reports, the difference that matters is rarely 99.2% against 99.8%; it is whether the report exists at all, names the seller as the client, covers this compound on its own, and is recent.
What Glutathione is, and what it is sold as
Glutathione is a tripeptide antioxidant every cell makes. UK sellers offer 1,500 mg vials for injection, a use UK regulators have warned against for cosmetic purposes; a certificate can confirm the content of a vial but says nothing about that warning.
| Development status | Licensed elsewhere, not in the UK, US or EU. Licensed as an injectable medicine in some countries, such as Italy, for medical indications. Not licensed in the UK. |
|---|---|
| Originator | A natural tripeptide, isolated in 1888 and characterised in 1929. Rights: No rights holder; generic. |
| Registered clinical trials | 269 on ClinicalTrials.gov |
A real molecule with real medical uses, none of them the one it is sold for. Glutathione is the tripeptide antioxidant every cell makes. Injectable glutathione is a licensed medicine in some European countries but not in the UK. PubMed indexes 1,331 papers on injected or cosmetic use, 120 of them clinical-trial reports, and ClinicalTrials.gov lists 269 registered trials, most of them of oral forms or of the precursor N-acetylcysteine in medical conditions.
Skin lightening has no trial support, and UK bodies have warned against it. The Joint Council for Cosmetic Practitioners states that glutathione is not licensed in the UK for skin lightening or any disease and that cosmetic indications do not justify an unlicensed prescription. On 26 June 2025 the Chartered Trading Standards Institute issued a public warning about glutathione skin-whitening drips, describing them as unregulated medical-style procedures with reports of anaphylaxis, and citing cases abroad of blindness and death.
What a certificate can tell you. The reports we read confirm the milligrams in a vial and its purity and, for one seller, the endotoxin and heavy-metal results for the same batch, which matter for anything injected. They say nothing about whether the use is lawful or wise.
The published record in numbers, and the sources
| Papers on PubMed | 1331 |
|---|---|
| Indexed as rat or mouse studies | 682 |
| Indexed as clinical trials | 120 |
| Published since 2020 | 365 |
Counts are from PubMed on 15 September 2026 using the queries recorded in our evidence file. A description of the published record, not medical advice and not an argument for or against use.
- N-Acetylcysteine is associated with changes in functional connectivity in patients with Parkinson's disease. (Parkinsonism Relat Disord, 2026, PMID 41619526)
- Absorption, Metabolism, Distribution and Excretion (ADME) and Absolute Bioavailability Assessment of Zongertinib in Healthy Male Volunteers. (Clin Drug Investig, 2026, PMID 41348300)
- Phase IB trial of high dose ascorbic acid + nab-paclitaxel + cisplatin + gemcitabine in patients with untreated metastatic pancreatic cancer. (Redox Biol, 2025, PMID 41197185)
- Multi-Plant Concentrated Powder Improved Skin Whitening: A Double-Blinded, Randomized, and Placebo-Controlled Clinical Study. (J Cosmet Dermatol, 2025, PMID 39927597)
- Glutathione as a skin-lightening agent and in melasma: a systematic review. (Int J Dermatol, 2025, PMID 39444151)
- Paracetamol (acetaminophen) poisoning: The early years. (Br J Clin Pharmacol, 2024, PMID 37683599)
- Exploring the Safety and Efficacy of Glutathione Supplementation for Skin Lightening: A Narrative Review. (Cureus, 2025, PMID 40013212)
- Joint Council for Cosmetic Practitioners, glutathione and unlicensed medicines used in cosmetic procedures
- Chartered Trading Standards Institute, public warning on glutathione skin-whitening IV drips (26 June 2025)
What regulators say about Glutathione
In the UK. Not licensed in the UK for any use; supplied by clinics as an unlicensed medicine, which the JCCP says cosmetic indications do not justify; CTSI public warning of 26 June 2025.
We hold no statement from the FDA, MHRA or EMA specifically about Glutathione on file. Its development and licence sources are listed under the record above.
What the 2 Glutathione certificates show
We have read 2 Janoshik reports covering Glutathione, published by 2 UK sellers. Each was opened on Janoshik's own website. All 2 name the seller itself as the client. All 2 are dated within the last six months. The newest is dated 7 Aug 2026 and the oldest 13 May 2026.
All 2 reports give a purity figure for Glutathione. The figures run from 99.001% to 99.167%, and all 2 are at 99% or above. A purity figure describes the sample the laboratory received, not every vial from that batch.
Read directly from the newest reports: Peptology Labs: task #217689, sample received 7 Aug 2026, 1501.98 mg recovered at 99.167%, client Peptology Labs Ltd; Phoenixbiolabs: task #147232, sample received 13 May 2026, 1539.65 mg recovered at 99.001%, client www.phoenixbiolabs.net.
A certificate is a batch document. The lines that matter are the compound (it must say Glutathione, not only a batch code), the client (the shop, not its supplier) and the analysis date. A new batch is untested until a new report appears.
Glutathione in the UK at a glance
| Active UK sellers listing Glutathione | 8 |
|---|---|
| Of which publish a verifiable own-name certificate | 2 |
| Of which name no laboratory at all | 2 |
Counted from the vendor ledger at build time. The A-Z directory lists every seller and what each publishes instead.
Questions people ask
Which UK sellers publish a verifiable Janoshik certificate naming Glutathione?
As of 10 October 2026, 2: Peptology Labs, Phoenixbiolabs. Each has a report on Janoshik's own website that names the seller as the client and lists Glutathione. That is a statement about paperwork, not a recommendation; The Peptide Watch does not recommend anywhere to buy Glutathione.
How recent is the newest Glutathione certificate from a UK seller?
The newest we have read is Janoshik task #217689, sample received 7 Aug 2026. It is published by Peptology Labs and names it as the client. A certificate covers one batch, so an old one says little about stock on sale today.
How do I check that a certificate for Glutathione is genuine?
Four things: an independent laboratory is named; the client field names the seller you are buying from, not a supplier; the compound line says Glutathione; and the report's task number and key open the same report on the laboratory's own website (verify.janoshik.com). A branded PDF with no laboratory name and no verification code fails on the first check, however professional it looks. The free COA Checker on this site runs the checks for you.
Is Glutathione a licensed medicine in the UK?
Not licensed in the UK for any use; supplied by clinics as an unlicensed medicine, which the JCCP says cosmetic indications do not justify; CTSI public warning of 26 June 2025. Licensed as an injectable medicine in some countries, such as Italy, for medical indications. Not licensed in the UK. The Peptide Watch does not give legal or medical advice.
Why does The Peptide Watch not say where to buy Glutathione?
Because the site records paperwork, not recommendations. A verifiable certificate proves that a sample of one batch was tested. It does not prove the vial you receive matches it, and it says nothing about whether anyone should use Glutathione. Listing which sellers publish a certificate you can check, and which publish nothing, is as far as the evidence goes.
The Peptide Watch's position on Glutathione
Not licensed in the UK for any use; supplied by clinics as an unlicensed medicine, which the JCCP says cosmetic indications do not justify; CTSI public warning of 26 June 2025. The Peptide Watch reads the certificates UK sellers publish and does not recommend anywhere to buy Glutathione. Sellers on this page are listed by the date of their newest Glutathione certificate and by nothing else. If you can verify a seller's testing, you can at least judge its evidence; if you cannot, you are taking the seller's word for what is in the vial. See how UK testing compares across every seller in the market statistics.
An honest note: a verifiable certificate proves a sample of a batch was tested, not that the specific vial you receive matches it, see what this can and can't tell you. The Peptide Watch sells no Glutathione and links to no shop; this is research-use-only information, not medical or dosing advice.
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