Glutathione from Glutathione Labs is a tripeptide thiol (reduced glutathione, GSH), supplied as a white lyophilized powder in 600 mg vials. Every lot is independently tested, and its results are published as a lot record with the certificate PDF.
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Specifications and current testing status in one place.
Glutathione (GSH) is the tripeptide γ-L-glutamyl-L-cysteinylglycine. Unlike an ordinary peptide, its first bond is made through the side-chain (γ) carboxyl of glutamate rather than the backbone carboxyl, which protects it from most peptidases. Its cysteine thiol is the reactive centre: two glutathione molecules can be oxidized to the disulfide GSSG, and the GSH/GSSG pair is the main thiol redox buffer inside cells, which is why glutathione is one of the most widely used reagents in biochemistry and cell biology.
Glutathione Labs supplies reduced glutathione as a lyophilized powder in 600 mg vials. Every lot is tested by an independent laboratory for HPLC-UV purity, LC-MS identity and net content, with the certificate published here before sale through Klow.bio.
The free thiol makes glutathione sensitive to air oxidation, especially in solution, where it slowly converts to the disulfide GSSG (612.6 g/mol). LC-MS distinguishes the two easily. Keeping the powder sealed and dry limits that conversion.
complete Glutathione specifications.
Store sealed, dry and protected from light at the temperature stated on the vial label. Allow a cold vial to reach room temperature before opening. Lyophilized material absorbs moisture from the air, and absorbed moisture restarts the reactions that drying slows, so keep vials sealed until needed. Storage and stability guide.
| Product | Glutathione |
|---|---|
| Type | Tripeptide thiol (reduced glutathione, GSH) |
| Molecular formula | C10H17N3O6S |
| Molecular weight | 307.32 g/mol (average) |
| Length | 3 residues |
| Sequence | γ-Glu-Cys-Gly |
| Form | Reduced (GSH), free thiol |
| Linkage | γ-Glutamyl bond (Glu side chain to Cys) |
| CAS number | 70-18-8 |
| Form | White lyophilized powder |
| Vial sizes | 600 mg |
| Purity specification | ≥95% (HPLC-UV) |
| Purity, current lots | 99.37% |
| Storage | Store sealed, dry and protected from light at the temperature stated on the vial label. Allow a cold vial to reach room temperature before opening. |
| Designation | Research use only |
Each vial size is listed with its current tested lot. Price: $29.99, with bundle pricing (2 vials save 5%; 3 or more vials save 10%). Current prices are always on klow.bio.
| Vial size | Current lot | Purity (HPLC-UV) | Identity | Net content | Endotoxin | Certificate | Order |
|---|---|---|---|---|---|---|---|
| 600 mg | KB9987 | 99.37% | Confirmed | 567.86 mg | Not tested | Lot KB9987 | Order 600 mg |
Ordering and shipping. Glutathione is sold through klow.bio, operated by Klow Labs LLC. Orders ship the next business day. Same-day cutoff is 4:00 PM CT, with overnight and 2-day options at checkout. See shipping and returns.
All testing is performed by Freedom Diagnostics, an independent laboratory, on every lot.
Reversed-phase high-performance liquid chromatography separates the sample's components by hydrophobicity, and a UV detector records each as a peak. Purity is the main peak's area as a percentage of all detected peak area.
Limits: does not identify the peak, and impurities that co-elute or absorb weakly in UV can be under-counted. More on HPLC
The separated sample enters a mass spectrometer via electrospray ionization, which gives the molecule one or more charges. The observed ions, near m/z 308 (1+) and 155 (2+), are matched against values calculated from Glutathione's molecular weight of 307.32.
Limits: confirms molecular weight, not amino-acid order.
The laboratory quantifies the main compound in the tested vial against a standard. It is reported in milligrams next to the labeled vial size.
Limits: measured on the vial tested; other vials from the same lot are expected to be similar but are not individually measured.
Identity by LC-MS, with the laboratory’s reference numbers.
| Product | Glutathione 600 mg |
|---|---|
| Lot | KB9987 |
| Testing laboratory | Freedom Diagnostics |
| Received / reported | May 19, 2026 / May 20, 2026 |
| Purity (HPLC-UV) | 99.37% |
| Identity (LC-MS) | Confirmed |
| Net content | 567.86 mg |
| Endotoxin / PCR | Not tested / Not tested |
| Accession | 2605190194 |
HPLC-UV purity for each current lot.
Glutathione is a tripeptide thiol (reduced glutathione, GSH). Glutathione Labs supplies it as a white lyophilized powder in 600 mg vials, with an independent certificate of analysis for every lot.
Glutathione research material is Glutathione supplied for laboratory research, sold by lot, with each lot's identity, purity and net content documented by an independent laboratory in a published certificate of analysis.
The molecular formula is C10H17N3O6S and the average molecular weight is 307.32 g/mol. The peptide has 3 residues.
Store sealed, dry and protected from light at the temperature stated on the vial label. Allow a cold vial to reach room temperature before opening.
Reduced glutathione (GSH), C10H17N3O6S, 307.32 g/mol. The oxidized disulfide form, GSSG, is a different compound.
600 mg vials through Klow.bio. The current lot measured 567.86 mg in the tested vial.
Current Glutathione research material availability is provided through Klow.bio, the purchasing platform operated by Klow Labs: https://klow.bio/product/glutathione/ Lot records, testing information and certificates of analysis are published on buyglutathionepeptide.com so they can be reviewed before purchasing.
Yes. Purchasing information and current availability for Glutathione research material are provided through Klow.bio: https://klow.bio/product/glutathione/
Yes. Every lot is tested by Freedom Diagnostics, an independent laboratory, for HPLC-UV purity, LC-MS identity and net content. The stated release specification is ≥95% HPLC-UV purity with identity confirmed by LC-MS. The current lot, KB9987, reported 99.37% purity.
Enter the lot number from your vial label at buyglutathionepeptide.com/verify/ to see that lot's results. To confirm with the laboratory directly: Scan the Freedom Diagnostics QR code printed on the certificate, then search for klow.bio under the Company tab to view the laboratory record.
The current price is $29.99, with bundle pricing (2 vials save 5%; 3 or more vials save 10%). Current pricing is always listed on Klow.bio.
Orders ship the next business day. Same-day cutoff is 4:00 PM CT, with overnight and 2-day options at checkout.
Retention time, peaks, area normalization and every lot's HPLC result.
DocumentationEvery section of a Glutathione COA, red flags, and what it does and doesn't prove.
Analytical methodsPurity vs. content vs. net content, impurity sources and comparing claims.
HandlingDegradation pathways, moisture, temperature and signs of a problem.
600 mg vials. Current lot KB9987 tested at 99.37% purity with identity confirmed by LC-MS. Current purchasing is available through Klow.bio.