The Peptide Directory

Not an FDA-approved standalone drugTripeptide antioxidantAntioxidant / longevity

Glutathione

Glutathione is a naturally occurring tripeptide (glutamate, cysteine, glycine) that acts as a major intracellular antioxidant and is sold as a supplement and as injectable compounded preparations.

Last reviewed by The Peptide Directory Editorial Team

What is Glutathione?

Glutathione is a naturally occurring tripeptide (glutamate, cysteine, glycine) that acts as a major intracellular antioxidant and is sold as a supplement and as injectable compounded preparations. Glutathione is not an fda-approved standalone drug; injectable products sold as "research use only" are not approved for human use.

Glutathione is a tripeptide compound consisting of glutamic acid attached via its side chain to the N-terminus of cysteinylglycine. It has a role as a geroprotector, an antioxidant, a cofactor, a mouse metabolite, an Escherichia coli metabolite, a human metabolite and a skin lightening agent. It is a thiol, a tripeptide and a L-cysteine derivative. It is a conjugate acid of a glutathionate(1-).

Key takeaways

  1. Glutathione is not an fda-approved standalone drug; injectable products sold as "research use only" are not approved for human use.
  2. PubMed indexes 180,033 papers on Glutathione (2,785 tagged as clinical trials) as of October 19, 2026.
  3. ClinicalTrials.gov lists 272 registered studies using Glutathione.
  4. 30 vendors in our directory listed Glutathione in their public catalog on October 19, 2026.

Structure

2D chemical structure of Glutathione (C10H17N3O6S), as depicted by PubChem
Structure: PubChem CID 124886 (C10H17N3O6S, 307.3 g/mol). 2D depiction from NCBI PubChem, retrieved October 19, 2026.

Regulatory & access status

Glutathione is not an fda-approved standalone drug; injectable products sold as "research use only" are not approved for human use.

Sellers that market unapproved peptides for human use can receive FDA warning letters; our vendor directory links any letter we found on fda.gov.

How much research exists on Glutathione?

PubMed indexes 180,033 papers mentioning Glutathione in the title or abstract, 49,636 of them from the last five years and 2,785 tagged as clinical trials (search run October 19, 2026; repeat the search).

Most relevant recent papers

Registered clinical studies

ClinicalTrials.gov lists 272 studies with Glutathione as an intervention (see all). Most recent:

What the evidence does not show

  • Paper counts measure research attention, not whether Glutathione works or is safe.
  • No FDA review of any "research use only" product's identity, purity, sterility or dose.

Research suppliers that list Glutathione

30 vendors in our directory listed a product matching Glutathione in their public catalog on October 19, 2026. Listed alphabetically; a listing is not an endorsement. Research use only.

Prices per mg, where we could verify them, are on our price comparison.

Glutathione reconstitution math

Lab arithmetic only, not dosing guidance: use the peptide calculator to turn a vial size and diluent volume into a concentration.

Glutathione FAQ

Is Glutathione FDA-approved?

Glutathione is not an fda-approved standalone drug; injectable products sold as "research use only" are not approved for human use.

Is Glutathione safe?

Safety data come from the published studies listed on this page; read them in full. Products sold as "research use only" have no FDA review of their purity, sterility or dose.

How much research is there on Glutathione?

PubMed indexes 180,033 papers on Glutathione (2,785 tagged as clinical trials) as of October 19, 2026.

Who sells Glutathione?

Atomik Labz, Backroad Aminos, BioGenix Peptides, Bulk Peptide Supply, Dynamic Peptide, Eros Peptides and 24 more listed it on their public catalogs when we checked; a listing is not an endorsement.

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