Glutathione (liposomal) — The Master Intracellular Antioxidant
Glutathione is a tripeptide that serves as the body's primary intracellular antioxidant and detoxifying agent. Liposomal delivery encapsulates glutathione in lipid vesicles, significantly improving its oral bioavailability and cellular uptake compared to standard oral forms, making it highly relevant for mitigating age-related oxidative stress.
Mechanism of Action
Glutathione directly neutralizes reactive oxygen species (ROS) and reactive nitrogen species (RNS), protecting cellular macromolecules from oxidative damage. It serves as an essential cofactor for antioxidant enzymes such as glutathione peroxidases and glutathione S-transferases. By maintaining the cellular redox state, it modulates signaling pathways including NF-κB, thereby reducing chronic sterile inflammation (inflammaging). Liposomal encapsulation protects the fragile tripeptide from enzymatic degradation in the gastrointestinal tract, allowing intact absorption and enhanced intracellular delivery.
Human Trial Evidence
Human trials have demonstrated that oral liposomal glutathione is superior to non-liposomal forms in elevating systemic glutathione levels. Clinical studies show that daily supplementation with liposomal glutathione increases glutathione stores in whole blood, erythrocytes, and plasma, while also reducing biomarkers of oxidative stress. Evidence specifically evaluating its impact on human longevity endpoints remains limited, though its role in supporting immune function and detoxification is well-established.
Dosing Protocol
Typical dosing ranges from 250 to 500 mg per day, taken orally. It is best taken on an empty stomach to maximize absorption. Some protocols suggest cycling or using it during periods of high oxidative stress or illness.
Safety & Contraindications
Generally well-tolerated with a strong safety profile. Potential adverse effects are rare but may include mild gastrointestinal upset or allergic reactions to the liposomal components (often derived from soy or sunflower lecithin). Caution is advised in individuals with asthma, as inhaled glutathione has been linked to bronchospasm, though this is not typically a concern with oral liposomal forms.