How to Store Glutathione: Temperature, Shelf Life & Handling
Storage requirements for Glutathione follow from what the molecule actually is — endogenous thiol tripeptide (γ-l-glutamyl-l-cysteinyl-glycine), reduced form. The conditions below reflect that chemistry rather than generic peptide guidance.
Overview
Freezer for the sealed powder. Once mixed, keep it cold, capped tight with as little air in the vial as possible, and use within about a week — or freeze small portions.
What Glutathione actually is
Glutathione is a very small peptide — just three building blocks, glutamate, cysteine and glycine — that nearly every cell makes for itself. Its sulfur group grabs reactive oxygen, which makes it the main built-in antioxidant researchers measure when they study oxidative stress. This is the reduced form, called GSH.
Supplied for laboratory research use only — not for human or animal use.
Third-party tested by HPLC and LC-MS, ≥99% purity, with a Certificate of Analysis available on request. Ships across Canada.
Technical detail below
Storage conditions for Glutathione
Why these conditions, specifically
The one chemistry to protect is the free thiol. Keep solutions cold, slightly acidic and low in oxygen, and use metal-free (or EDTA-containing) buffers where the protocol allows.
The main route to be aware of: oxidation of the cysteine thiol to glutathione disulfide (GSSG, about 612.6 Da), catalysed by trace Cu²⁺/Fe³⁺ and faster at neutral-to-alkaline pH.
All 3 degradation routes for GlutathioneFreeze–thaw
Tolerates a few freeze-thaw cycles, but each thaw exposes the thiol to dissolved oxygen. Aliquot once and thaw each portion only once.
What Glutathione is studied for
Glutathione is the most abundant low-molecular-weight thiol in most cells, and the ratio of reduced to oxidised glutathione is widely used as a read-out of oxidative stress in cell-culture and tissue studies.
Meister and Anderson (Annu Rev Biochem 1983) reviewed glutathione synthesis by γ-glutamylcysteine synthetase and glutathione synthetase, and its breakdown by γ-glutamyl transpeptidase — the framework most synthesis and turnover studies still use.
GSTs conjugate glutathione to electrophilic compounds, and this conjugation step is a standard model in xenobiotic-metabolism research.
Glutathione peroxidases use GSH to reduce hydrogen peroxide and lipid hydroperoxides, with glutathione reductase recycling GSSG back to GSH using NADPH — a common model for studying peroxide handling in vitro.
Summarizes published preclinical literature — see the selected references below. Provided for research reference only; not a claim of efficacy or a description of human use.
References describe in-vitro and preclinical research and are listed for reference only — not evidence of efficacy and not a description of human use.
More Glutathione reference
Diluent selection, dissolution behaviour, and the calculator preset for this compound.
Which solvents work, why, and what abnormal dissolution behaviour indicates.
The specific chemical routes by which this molecule breaks down, and how to limit each.
Which assays are informative for this molecule, and what to actually check on its COA.
Compound-specific bench practices, and the errors most often made with this molecule.
What to inspect on arrival, and which conditions actually warrant rejecting a vial.
Questions specific to this compound — structure, chemistry, and common misconceptions.
Storage reference for other compounds
Reviewed for research-use compliance by Kobi Williams, Founder — Popular Peptides Canada. Last reviewed 22 July 2026.
Glutathione is supplied strictly as a research chemical for in-vitro laboratory and research use only. It is not intended for human or animal consumption, diagnostic, or therapeutic use. This page is educational laboratory-handling reference information — not medical advice, not usage guidance, and not a protocol.