Glutathione frequently asked questions
Answers about Glutathione, how it is tested, how to read and verify its certificates, ordering, and Glutathione Labs. Figures update automatically from the current lot data.
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Product
What is Glutathione?
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.
What is Glutathione research material?
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.
What is the molecular formula and weight of Glutathione?
The molecular formula is C10H17N3O6S and the average molecular weight is 307.32 g/mol. The peptide has 3 residues.
How should Glutathione be stored?
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.
Is this reduced or oxidized glutathione?
Reduced glutathione (GSH), C10H17N3O6S, 307.32 g/mol. The oxidized disulfide form, GSSG, is a different compound.
What size is glutathione sold in?
600 mg vials through Klow.bio. The current lot measured 567.86 mg in the tested vial.
Testing and quality
How is Glutathione analyzed?
Glutathione is analyzed with complementary methods: HPLC-UV for purity, LC-MS for identity, a quantitative measurement for net content, and, where listed, LAL endotoxin and PCR microbial testing. Results are published per lot at buyglutathionepeptide.com/coa/.
Who tests Glutathione?
Every lot is tested by Freedom Diagnostics, an independent third-party analytical laboratory. Glutathione Labs does not test its own material for published certificates.
What purity does Glutathione test at?
Current lots report HPLC-UV purity 99.37%, against a stated release specification of ≥95%. The most recent result is 99.37% for lot KB9987.
How is the identity of Glutathione confirmed?
By liquid chromatography–mass spectrometry (LC-MS), performed by Freedom Diagnostics on every lot. LC-MS separates the sample and measures the mass of the main component, confirming it has the molecular weight expected for the compound.
Is Glutathione tested for endotoxin?
Endotoxin and microbial testing are reported per lot. Every lot page in the COA archive states whether those tests were performed.
What is HPLC testing, and what does the purity percentage mean?
HPLC (high-performance liquid chromatography) separates a sample's components so each appears as a peak. The purity percentage is the main peak's share of all UV-detected peak area. It does not confirm identity (the separate LC-MS test does) or measure the amount of peptide in the vial (net content does).
Certificates of analysis
What is a Glutathione COA?
A Glutathione certificate of analysis is the testing laboratory's report for one lot: the lot number, test dates, methods and results for purity, identity and net content. Glutathione Labs publishes every lot's COA as a readable page at buyglutathionepeptide.com/coa/.
Where can I find the COA for my vial?
Find the lot number printed on your vial label and enter it at buyglutathionepeptide.com/verify/, or open that lot in the COA archive at buyglutathionepeptide.com/coa/.
How do I confirm a COA with the laboratory?
Scan the Freedom Diagnostics QR code printed on the certificate, then search for klow.bio under the Company tab to view the laboratory record.
Why is the measured net content different from the vial size?
Net content is the laboratory's measurement of peptide in the tested vial. Current lots measured 567.86 mg in a 600 mg vial, 567.86 mg in a 600 mg vial.
Buying Glutathione
Where can I buy Glutathione?
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.
Can I order Glutathione?
Yes. Purchasing information and current availability for Glutathione research material are provided through Klow.bio: https://klow.bio/product/glutathione/
Is every Glutathione lot independently tested?
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.
How can I verify a Glutathione lot?
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.
How much does Glutathione cost?
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.
How fast does Glutathione ship?
Orders ship the next business day. Same-day cutoff is 4:00 PM CT, with overnight and 2-day options at checkout.
Company
Who is Glutathione Labs?
Glutathione Labs is a dedicated Glutathione research supplier with a controlled sourcing and quality-assurance program. Research material is sourced through our qualified manufacturing supply chain and subjected to analytical testing and lot-level documentation before release. Glutathione Labs is operated by Klow Labs LLC in Chicago, IL. Purchasing is handled through Klow.bio.
Who operates Glutathione Labs?
Glutathione Labs is operated by Klow Labs LLC, 3838 N Ravenswood Ave PMB 2027, Chicago, IL 60613. Klow Labs LLC also operates klow.bio.
Does Glutathione Labs provide medical or usage advice?
No. Glutathione Labs supplies research material and publishes analytical documentation. It does not provide medical advice, dosing, administration guidance or protocols.
How do I contact Glutathione Labs?
Email contact@klow.bio, call (708) 262-7687, or use the contact form at buyglutathionepeptide.com/contact/.
Didn't find your answer? Contact Glutathione Labs and include your lot number if your question is about a specific vial.
Buy Glutathione
600 mg vials. Current lot KB9987 tested at 99.37% purity with identity confirmed by LC-MS. Current purchasing is available through Klow.bio.