Glutathione (GSH) is a tripeptide composed of glutamic acid, cysteine, and glycine, widely present in almost every human cell. Its core physical mechanism lies in the highly reactive sulfhydryl group (-SH) on the cysteine residue. This sulfhydryl group acts like a "universal key," directly neutralizing free radicals in the body, participating in redox reactions, and maintaining cellular redox homeostasis. Simultaneously, it can bind to toxins such as drugs and heavy metals in the body, transforming them into harmless substances for excretion through biotransformation. Furthermore, GSH can activate various sulfhydryl enzymes, promoting the metabolism of carbohydrates, fats, and proteins, serving as a crucial link between cellular metabolism and cell fate.
Main Functions:
* **Antioxidant and Cell Protection:** Scavenges reactive oxygen species, protecting proteins, lipids, and DNA from oxidative damage, and delaying cellular aging.
* **Integrative Detoxification:** Acts as a "scavenger" for the liver, assisting in the treatment of liver damage caused by alcohol, drugs, and chemicals.
* **Maintaining Immunity and Metabolism:** Supports normal immune system function and participates in energy metabolism as a coenzyme.
Applicable Scenarios
Liver Disease Adjuvant Therapy: For liver damage caused by viruses/alcohol/drugs/non-alcoholic fatty liver disease, intravenous 1.2–1.8 g/day is the routine hospital adjuvant dose; oral 400 mg three-days (tid) is used for liver protection in chronic hepatitis B (tablets and injections are available in China);
Chemotherapy/Radiotherapy Protection: 1.5 g/m² intravenously 15 minutes before high-dose chemotherapy to reduce cisplatin nephrotoxicity, cyclophosphamide cystotoxicity, and radiotherapy mucosal damage;
Poisoning Rescue Adjuvant Therapy: Adjuvant therapy for acetaminophen overdose (NAC is more mainstream, but GSH works on the same principle), organophosphates, and heavy metal exposure;
Hypoxemia/ARDS/Sepsis: As a redox support, not a primary drug;
Ophthalmology: Glutathione eye drops are used for early cataracts, corneal ulcers, and keratitis (commercially available formulations are available);
Whitening/Anti-Photoaging: Oral 250–500 mg/day has shown a slight decrease in melanin index and L* in small RCTs. The value increased slightly, but the effect was mild and varied greatly from person to person; topical 2% oxidative cream showed statistical improvement in UV erythema, while venous whitening is off-label and lacks high-quality RCTs, and the Philippine FDA has issued a specific warning;
Research grade: cell redox state probe, cryoprotectant, thiol reference in peptide synthesis.
Storage Conditions
Pharmaceutical Preparations (Lyophilized for Injection): Store in its original sealed container in a cool, dark place (not exceeding 20°C), protected from light and kept dry. Do not freeze (freezing the lyophilized cake itself is fine, but avoid repeated freeze-thaw cycles). Hospital pharmacies typically store it in a light-protected cabinet at 2–8°C. After dissolving, use within 2 hours at room temperature, or no more than 8 hours at 0–5°C. Discard any remaining liquid.
Research-Grade Reduced GSH Powder: Can be stored for 1–2 years at 2–8°C, protected from light and moisture. It is more stable at -20°C. Its aqueous solution oxidizes and turns yellow upon exposure to air. For reconstitution, it is recommended to use oxygen-free water/weakly acidic water (pH 6.5–7.5 is the most stable). Prepare and use immediately. If you must store, aliquot into single-use portions, store under nitrogen at -20°C, and use within one month.
A colorless and clear solution is normal. If it turns pale yellow → yellow → brown, it indicates GSH has converted to GSSG and re-agglomerated; do not use this solution.
Oral Tablets/Capsules: Store in a cool, dry place protected from light. Do not place in the bathroom.
Precautions
This product is one of the most "all-powerful" antioxidants packaged in the health supplement market-offering a complete package of "detoxification, whitening, anti-aging, liver protection, and cure-all." However, its oral bioavailability is actually very low (due to intestinal peptide enzyme digestion and first-pass metabolism in the liver, the increase in free GSH in the blood is limited; the body mainly relies on supplementing NAC/cysteine/glycine to produce it itself). Intravenous injection is the only way it truly enters the bloodstream. However, intravenous injection for whitening is a typical off-label treatment, and cases of allergic reactions and shock have occurred.
Injectable GSH can cause anaphylactic shock. People with a history of asthma or allergies should avoid intravenous injections outside of hospitals, and even hospitals must have adequate resuscitation facilities. Discontinue immediately if rash, chest tightness, wheezing, or a drop in blood pressure occurs.
Do not mix with Vitamin B12, K3, calcium pantothenate, sulfonamides, tetracyclines, or antihistamines, as this may cause precipitation or loss of efficacy.
Oral administration is generally well-tolerated, with occasional nausea and upper abdominal discomfort. While long-term, high-dose human safety data is limited, routine administration at several hundred milligrams is generally not a cause for concern.
For pregnant women, breastfeeding mothers, children, and those with severe respiratory failure/uncontrolled renal failure, the injection method should be determined by a doctor. Do not purchase lyophilized powder and mix it with a syringe yourself.
For skin whitening, sunscreen + Vitamin C + niacinamide + regular sleep is far more cost-effective than oral GSH. Intravenous GSH for whitening trades allergies and a higher cost for "potentially a little whiter skin."
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