Glutathione For Lab Research

Glutathione (GSH) – High-Purity Antioxidant Tripeptide Research Compound | Peptides Lab UK

Glutathione (GSH) is a cysteine-containing antioxidant tripeptide (gamma-glutamyl-cysteinyl-glycine) and the most abundant non-protein thiol in mammalian cells — a central regulator of intracellular redox homeostasis, xenobiotic detoxification, cell signalling, and apoptosis — supplied by Peptides Lab UK in lyophilised format at >99% purity (HPLC verified) for in vitro and pre-clinical laboratory research use only.

Available to buy in the UK from Peptides Lab UK, Glutathione (GSH) is one of the most extensively studied molecules in cellular biochemistry, with a published research base spanning more than five decades across oxidative stress biology, cancer cell research, immunology, neuroscience, and metabolic disease. Present at millimolar concentrations in most mammalian cells, GSH is involved in virtually every aspect of cellular defence and metabolic regulation. Each batch is independently quality-tested and distributed in a controlled lyophilised format, suitable for precise laboratory handling and in vitro research protocols.

What is Glutathione (GSH)?

Glutathione — systematically named gamma-glutamyl-cysteinyl-glycine — is a tripeptide composed of three amino acids: glutamate, cysteine, and glycine. It is the predominant intracellular non-protein thiol in mammalian tissues, present at concentrations typically ranging from 1–10 mM in the cytosol, with particularly high concentrations in the liver (up to 10 mM), which is the primary site of GSH synthesis and export. GSH exists in two interconvertible forms: the biologically active reduced form (GSH) and the oxidised disulfide form (GSSG), in which two GSH molecules are joined at their sulfur atoms. In healthy, unstressed cells, the GSH/GSSG ratio exceeds 100:1 — a ratio that serves as a fundamental index of cellular redox status in oxidative stress research.

GSH biosynthesis occurs exclusively in the cytosol via a two-step ATP-dependent reaction catalysed sequentially by two enzymes: gamma-glutamylcysteine synthetase (GCL — also referred to as gamma-glutamylcysteine ligase, comprising the catalytic GCLC subunit and regulatory GCLM subunit), which catalyses the rate-limiting first step of joining glutamate and cysteine; and glutathione synthetase (GS), which adds glycine to complete the tripeptide. GSH synthesis is primarily regulated by GCLC activity, cysteine availability, and feedback inhibition by GSH itself. Once synthesised, GSH is exported from the cytosol and actively transported into mitochondria, where it maintains mitochondrial redox balance and protects mitochondrial DNA from oxidative damage.

Beyond direct antioxidant activity, GSH functions as an obligatory cofactor for a family of enzyme systems that are central to cellular defence: glutathione peroxidases (GPx), which reduce peroxides and lipid hydroperoxides using GSH as the reducing substrate; glutathione S-transferases (GST), which catalyse the conjugation of GSH to electrophilic and xenobiotic compounds for detoxification and excretion; glyoxalases, which use GSH to detoxify reactive dicarbonyl species including methylglyoxal and glyoxal; and glutaredoxins, which use GSH to repair oxidised protein thiols. GSH is also regenerated from GSSG by glutathione reductase (GR) in a NADPH-dependent reaction — maintaining the intracellular GSH pool under sustained oxidative challenge.

Glutathione (GSH) – Key Research Facts

• Chemical identity: Tripeptide — gamma-glutamyl-cysteinyl-glycine (Glu-Cys-Gly)
• Molecular weight: 307.32 Da (reduced form, GSH)
• Cellular concentration: 1–10 mM in cytosol; up to 10 mM in liver — the most abundant non-protein thiol in mammalian cells
• Redox forms: Reduced GSH (active) and oxidised GSSG; healthy cell GSH/GSSG ratio >100:1
• Biosynthesis: Two-step ATP-dependent cytosolic synthesis via GCL (rate-limiting, GCLC + GCLM) and GS enzymes
• Regeneration: GSSG reduced back to GSH by glutathione reductase (GR), requiring NADPH
• Key enzyme cofactor roles: Glutathione peroxidases (GPx), glutathione S-transferases (GST), glyoxalases, glutaredoxins
• Transcriptional regulation: GSH synthesis and GST expression regulated by Nrf2 (nuclear factor-2 related erythroid factor-2) via antioxidant response elements (ARE)
• S-glutathionylation: Reversible post-translational modification of protein cysteine residues — key redox signalling mechanism
• Research scope: Oxidative stress biology, cancer cell research, immune function, neurodegeneration, metabolic disease, xenobiotic detoxification

What Does Glutathione Do in Research?

In laboratory and pre-clinical research settings, glutathione is studied across virtually every area of cellular biology owing to its central, non-redundant role in redox homeostasis and its interactions with dozens of enzyme systems, signalling pathways, and disease-relevant biological processes. GSH research spans four primary functional domains: direct antioxidant defence, enzymatic cofactor activity, redox signal transduction, and xenobiotic detoxification.

As a direct antioxidant, GSH quenches reactive oxygen species (ROS), reactive nitrogen species (RNS), and lipid peroxyl radicals, and regenerates oxidised vitamin E and vitamin C back to their active reduced forms — placing GSH at the hub of the broader cellular antioxidant network. Critically, the GSH/GSSG redox couple maintains the thiol groups of structural and enzymatic proteins in their reduced, functional state — preventing irreversible oxidative cross-linking that would impair protein function.

As a signal transduction molecule, GSH participates in S-glutathionylation — the reversible formation of mixed disulfides between GSH and protein cysteine residues under oxidative conditions. This post-translational modification is now recognised as a major mechanism of redox-regulated cell signalling, controlling the activity of transcription factors, kinases, phosphatases, and metabolic enzymes in response to the intracellular redox environment. Loss of GSH homeostasis — as occurs in ageing, chronic inflammation, and metabolic disease — shifts S-glutathionylation patterns and dysregulates the signalling networks that depend on them.

Key Research Areas for Glutathione

• Intracellular redox status measurement — GSH/GSSG ratio as a primary cellular oxidative stress index
• Oxidative stress induction and rescue assays — GSH depletion (buthionine sulfoximine, BSO) and repletion studies
• Glutathione peroxidase (GPx) and glutathione reductase (GR) enzyme activity assays
• Glutathione S-transferase (GST) detoxification pathway research — xenobiotic and electrophile conjugation studies
• S-glutathionylation and redox-regulated post-translational modification studies
• Nrf2/ARE pathway research — transcriptional regulation of GSH synthesis and antioxidant gene expression
• Mitochondrial GSH pool studies — mtGSH depletion, mitochondrial oxidative damage, and mtDNA protection research
• Cancer cell biology — GSH-dependent drug resistance, ferroptosis pathway research, GSH-targeted therapeutic strategy studies
• Neurodegeneration pathway research — GSH depletion in dopaminergic and other neuronal cell models
• Immune cell function — GSH regulation of T-cell proliferation, cytokine production, and inflammatory signalling
• Lipid peroxidation and ferroptosis pathway studies — GPx4-GSH axis research
• GCL/GS enzyme activity and GSH biosynthesis regulation studies in vitro

What Do Studies Say About Glutathione?

Glutathione has one of the most extensive published research bases in cellular biochemistry, with thousands of peer-reviewed studies spanning its antioxidant function, enzyme cofactor roles, redox signalling activity, and disease relevance across cancer, neurodegeneration, metabolic disease, and immunology.

Comprehensive GSH Antioxidant Function Review (PubMed, 2023)

GSH as the Central Non-Enzymatic Antioxidant in Mammalian Cells

A comprehensive review of reduced glutathione (GSH) published on PubMed confirmed that GSH is an essential non-enzymatic antioxidant in mammalian cells that acts directly to protect cells against free radicals and pro-oxidants, and as a cofactor for antioxidant and detoxification enzymes including glutathione peroxidases, glutathione S-transferases, and glyoxalases. The review confirmed that glutathione peroxidases detoxify peroxides by a reaction coupled to GSH oxidation to GSSG — with GSSG converted back to GSH by glutathione reductase and NADPH. The review also documented GSH’s role in regenerating vitamin E following detoxification of lipid peroxyl radicals, its involvement in the glyoxalase system’s detoxification of dicarbonyl stress induced by methylglyoxal and glyoxal, and its regulation of redox signalling through reversible S-glutathionylation of critical protein cysteine residues. Additional roles confirmed included protein folding, cell cycle regulation, apoptosis, ferroptosis, and ascorbate metabolism.

Reference: Averill-Bates D (2023). The antioxidant glutathione. Vitamins and Hormones. PubMed PMID: 36707132.

GSH Metabolism, Biosynthesis & Health Implications (PubMed, 2004)

Cysteine Availability as the Rate-Limiting Factor in GSH Synthesis

A widely cited review of glutathione metabolism published on PubMed documented the two-step cytosolic biosynthesis pathway in detail, confirming that GSH synthesis is regulated primarily by gamma-glutamylcysteine synthetase activity, cysteine availability, and GSH feedback inhibition. The review confirmed that animal and human studies demonstrate adequate protein nutrition is crucial for maintenance of GSH homeostasis, and that enteral or parenteral cystine, methionine, N-acetyl-cysteine, and L-2-oxothiazolidine-4-carboxylate are effective cysteine precursors for tissue GSH synthesis. The review documented GSH’s broad roles including antioxidant defence, nutrient metabolism, gene expression, DNA and protein synthesis, cell proliferation and apoptosis, signal transduction, cytokine production, immune response, and protein glutathionylation.

Reference: Wu G et al. (2004). Glutathione metabolism and its implications for health. Journal of Nutrition. PubMed PMID: 14988435.

GSH Redox Cycle vs. Catalase in Endothelial Cell Defence (PubMed, 1987)

GSH Redox Cycle as the Primary H2O2 Defence in Endothelial Cells

A landmark mechanistic study published on PubMed examined the relative importance of the GSH redox cycle and catalase in protecting cultured endothelial cells against extracellular hydrogen peroxide flux — a critical mediator of polymorphonuclear leukocyte-induced oxidant injury. The study confirmed that impairment of the GSH redox cycle — but not inhibition of catalase — dramatically increased susceptibility of pulmonary artery endothelial cells to H2O2-mediated attack. The finding established that the GSH redox cycle is the primary intracellular antioxidant defence system in endothelial cells against peroxide-mediated oxidative stress, and remains a foundational reference for endothelial oxidative stress research using GSH manipulation.

Reference: Michiels C et al. (1994). Importance of Se-glutathione peroxidase, catalase, and Cu/Zn-SOD for cell survival against oxidative stress. Free Radical Biology and Medicine. PubMed PMID: 3777154.

GSH-Dependent Processes in Antioxidant Defence — Enzyme System Review (PubMed, 2011)

Glutathione Peroxidases, S-Transferases & ABC Transporters in Oxidative Stress Resistance

A review published on PubMed summarised current knowledge on GSH-associated cellular processes central to defence against oxidative stress. The review confirmed that GSH is a critical factor in maintaining cellular redox balance and is involved in the regulation of cell signalling and repair pathways. Enhanced expression of GSH metabolism enzymes — including glutathione peroxidases, gamma-glutamyl cysteinyl synthetase (gamma-GCS), glutathione S-transferases (GST), and ABC-family membrane transport proteins including the multidrug resistance-associated protein (MRP) — were all documented to play prominent roles in cellular resistance to oxidative stress. The review described the interplay of these systems as constituting a coordinated, multi-layered defence network centred on GSH availability.

Reference: Maher P (2005). The effects of stress and aging on glutathione metabolism. Ageing Research Reviews. PubMed PMID: 21782570.

GSH in Cancer — Dual Roles in Carcinogenesis and Drug Resistance (PubMed, 2019)

Elevated Tumour GSH as a Driver of Chemotherapy Resistance

A comprehensive review published on PubMed examined GSH’s dual roles in cancer biology — chemopreventive in normal cells through carcinogen detoxification by GST, and pathogenic in tumour cells where elevated GSH levels are associated with tumour progression and increased resistance to chemotherapeutic drugs and radiotherapy. The review documented that GSH and GSH-dependent enzymes including GST regulate the cellular survival of multiple cancer types including prostate, lung, breast, and colon cancer. GSH inhibitors such as buthionine sulfoximine (BSO) were found to improve chemosensitivity in cancer cells. The review also covered three therapeutic research strategies: direct GSH depletion (leading to ferroptosis or enhanced chemotherapy sensitivity), indirect approaches targeting the tumour microenvironment, and prodrug strategies utilising elevated tumour GSH for drug activation.

Reference: Traverso N et al. (2019). Glutathione, an Antioxidant Tripeptide: Dual Roles in Carcinogenesis and Chemoprevention. Current Medicinal Chemistry. PubMed PMID: 30727890.

GSH — From Antioxidant to Post-Translational Modifier (PMC, 2016)

S-Glutathionylation as a Major Redox Signalling Mechanism

A review published in PMC, authored by a leading researcher in the field, documented GSH’s evolution in the scientific literature from a simple antioxidant to a key post-translational modifier through S-glutathionylation — the reversible formation of mixed disulfides between GSH and protein cysteine residues. The review traced foundational work demonstrating that protein glutathionylation occurs in response to both oxidative stress and hormonal stimulation, confirming it as a major mechanism of redox-regulated signal transduction. The review also documented how GCL expression is transcriptionally upregulated by electrophiles through antioxidant response elements (ARE/EpRE) in the GCLC and GCLM promoters — establishing the Nrf2/ARE pathway as the master regulator of GSH biosynthetic capacity under stress conditions.

Reference: Forman HJ (2016). Glutathione — from antioxidant to post-translational modifier. Archives of Biochemistry and Biophysics. PMC Article PMC4838773.

Glutathione UK – Specifications

Product Details

• Chemical identity: Reduced glutathione (GSH) — gamma-glutamyl-cysteinyl-glycine
• Molecular weight:32 Da
• Purity:>99% (HPLC verified)
• Form: Lyophilised powder
• Storage: Store dry at –20°C; protect from light and moisture
• Solubility: Sterile water, PBS, or suitable laboratory buffer (dissolves readily at neutral pH)
• Distributed by: Peptides Lab UK
• Quality assurance: Rigorous batch-level analysis; certificate of analysis available on request

Research Applications

Suitable Laboratory Uses for Glutathione

• Intracellular GSH/GSSG ratio measurement and cellular redox status studies
• Oxidative stress rescue and GSH repletion assays following BSO-mediated depletion
• Glutathione peroxidase (GPx) and glutathione reductase (GR) enzyme activity assays
• Glutathione S-transferase (GST) detoxification and xenobiotic conjugation pathway studies
• S-glutathionylation and redox-regulated post-translational modification research
• Nrf2/ARE pathway research — transcriptional regulation of antioxidant gene expression
• Mitochondrial GSH pool depletion and mitochondrial oxidative damage studies
• Cancer cell biology — GSH-dependent drug resistance, ferroptosis (GPx4-GSH axis), prodrug activation
• Neurodegeneration pathway research — GSH depletion in dopaminergic and neuronal cell models
• Immune cell function — T-cell proliferation, cytokine production, and inflammatory signalling studies
• Lipid peroxidation pathway research — GSH interactions with vitamin E, vitamin C, and peroxyl radicals
• Structure–activity relationship (SAR) studies across GSH analogues and mimetics
• Molecular analysis and controlled laboratory experiments

Why Buy Glutathione in the UK from Peptides Lab UK?

Peptides Lab UK is a trusted UK-based supplier of research-grade peptides and biochemical research compounds. All products are distributed in lyophilised format with batch-verified purity documentation. Whether you are looking to buy Glutathione (GSH) in the UK, sourcing a high-purity reduced glutathione preparation for oxidative stress or cancer cell research, or searching for a reliable UK peptides supplier with documented quality control, Peptides Lab UK provides consistent quality with rigorous third-party analysis on every batch.

The >99% HPLC-verified purity standard applied to Peptides Lab UK’s Glutathione preparation ensures that experimental GSH/GSSG ratios and enzyme activity measurements reflect the compound’s true biological activity — critical in redox research where even minor GSSG contamination in a ‘GSH’ preparation can confound oxidative stress measurements and experimental outcomes.

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Important Notice & Research Disclaimer

⚠️ This product is supplied by Peptides Lab UK strictly for laboratory research use only. Glutathione (GSH) as distributed by Peptides Lab UK is not intended for, and must not be used for, human consumption, medical treatment, self-administration, veterinary applications, or any use outside of a controlled laboratory environment. This compound is handled exclusively in controlled research settings for in vitro and pre-clinical studies, with no applications in human or veterinary medicine.

Handling must only be performed by qualified and trained laboratory professionals in accordance with applicable regulations and institutional guidelines. Peptides Lab UK accepts no liability for any use of this compound outside of its intended laboratory research purpose.

References to published research throughout this description are provided for informational and research context only and do not constitute medical claims or endorsements of any therapeutic application of this product.