Compare prices and buy Glutathione from 38 research peptide vendors - also called suppliers or sources. Updated daily.
A tripeptide (gamma-L-glutamyl-L-cysteinyl-glycine, CAS 70-18-8), the major intracellular antioxidant and a substrate of glutathione-S-transferases and glutathione peroxidases. Human studies disagree on how well oral glutathione is absorbed, since gut and liver enzymes break much of it down. Research-peptide vendors sell it as vials, liquids and bulk raw material. Not a peptide in the signaling sense but catalogued here for commercial-intent reasons alongside the longevity cofactors. Injectable glutathione has no FDA approval.
For research purposes only. Not medical advice.
Glutathione (chemically gamma-L-glutamyl-L-cysteinyl-glycine) is a tripeptide and the body's principal intracellular antioxidant. Its reactive cysteine thiol lets it cycle between a reduced form (GSH) and an oxidized form (GSSG), and that couple is one of the main ways cells buffer oxidative stress. Glutathione is also the substrate for two important enzyme families: glutathione peroxidases, which neutralize peroxides, and glutathione-S-transferases, which conjugate glutathione onto toxins and metabolites to mark them for elimination.
Strictly, glutathione is a peptide by structure but not a signaling peptide in the hormonal sense. It is catalogued here because research-peptide vendors sell it alongside longevity and antioxidant compounds such as NAD+.
In a single-dose study in healthy volunteers (Witschi and colleagues, European Journal of Clinical Pharmacology, 1992), plasma glutathione did not rise significantly after the dose, which the authors attributed to hydrolysis by intestinal and hepatic gamma-glutamyltransferase. A six-month randomized, placebo-controlled trial in healthy non-smoking adults (Richie and colleagues, European Journal of Nutrition, 2015) reported rises from baseline in glutathione levels in blood and in several cell types.
Injectable glutathione is not FDA-approved. FDA lists glutathione in Category 1, bulk drug substances under evaluation, on both its Section 503A and Section 503B nomination lists, and in neither pathway's Category 2. FDA warned compounders in 2019, and again in August 2026, not to make sterile injectables from dietary-supplement-grade glutathione, after adverse events consistent with endotoxin exposure (the 2026 notice cites at least 30 patients). Glutathione is also marketed internationally as a skin-lightening injection. A 2019 Philippine FDA advisory warned against that use, stating that no published clinical trial had evaluated it, and noted that injectable glutathione is approved in the Philippines as an adjunct in cisplatin chemotherapy. In 2015 the Saudi FDA warned against all glutathione skin-whitening injections, which it said were unregistered and illegally marketed online, citing their unknown manufacturing conditions and unguaranteed safety.
Glutathione is sold under its own name or as "L-Glutathione", a synonym for the same reduced form (GSH). The L refers to the configuration of its amino acids, not to its redox state. PeptideScouter indexes it as vials, liquids and bulk raw material, computes a per-milligram price for the vials only, and verifies identity against its molecular formula (C10H17N3O6S, CAS 70-18-8).
Structurally, yes. Glutathione is a tripeptide (gamma-L-glutamyl-L-cysteinyl-glycine). It is not a signaling peptide in the hormonal sense but serves as the body's main intracellular antioxidant and as a substrate for detoxification enzymes. It is catalogued on PeptideScouter because research-peptide vendors sell it alongside their catalogs.
No. Injectable glutathione is not FDA-approved. FDA warned compounders in 2019, and again in August 2026, not to make sterile injectables from dietary-supplement-grade glutathione after adverse events consistent with endotoxin exposure. Research-vendor material is for laboratory use only, not for human consumption.
Published human studies differ in design and in result. In a 1992 single-dose study in healthy volunteers (Witschi and colleagues), plasma glutathione did not rise significantly, which the authors attributed to breakdown by intestinal and liver enzymes. A 2015 six-month randomized, placebo-controlled trial in healthy non-smoking adults (Richie and colleagues) reported rises from baseline in glutathione levels in blood and in several cell types.
GSH is the reduced form of glutathione and GSSG is the oxidized form (two glutathione molecules joined by a disulfide bond). Cells cycle between the two as glutathione neutralizes reactive species, and the GSH-to-GSSG ratio is a common laboratory marker of oxidative stress.
Glutathione is sold by 38 research peptide vendors indexed on PeptideScouter, with 58 tracked listings compared per vendor in the table above. Pricing is normalized and refreshed daily.
29 of the 38 indexed vendors currently have Glutathione in stock. The comparison table marks out-of-stock listings, and stock state is refreshed daily.
Renova Peptides currently lists Glutathione at $0.02/mg, the lowest listed price across 38 tracked research peptide vendors. With current vendor discount codes applied, the lowest effective price is $0.02/mg.
Discount codes are issued per vendor rather than per peptide, so any code applies across that vendor's whole catalog. All 38 vendors listing Glutathione publish a PeptideScouter code, worth 5% to 25% off. Applied, the lowest effective price falls from $0.02/mg listed to $0.02/mg at Renova Peptides. Each vendor's code is shown beside its price in the table above.
Glutathione ranges from $0.02/mg to $0.20/mg across 58 listings from 38 research peptide vendors, normalized to USD per milligram and refreshed daily.
38 research peptide vendors currently list Glutathione on PeptideScouter, with 29 in stock right now. We track 58 listings across size and kit variants.
Glutathione's CAS Registry Number is 70-18-8. It is also sold as L-Glutathione.
