Glutathione

Glutathione (GSH) is a tripeptide composed of glutamate, cysteine, and glycine. It is the most abundant intracellular antioxidant in the human body and plays a central role in protecting cells from oxidative damage, detoxifying harmful substances, and supporting immune function. Often called the "master antioxidant," glutathione is unique in that it can regenerate other antioxidants (such as vitamins C and E) and is involved in virtually every cellular defense process.

Glutathione's functions extend far beyond simple antioxidant activity. It serves as a critical cofactor for glutathione peroxidases and glutathione-S-transferases, enzyme families essential for neutralizing reactive oxygen species and detoxifying xenobiotics (foreign chemicals). It plays a role in DNA synthesis and repair, protein synthesis, amino acid transport, and regulation of the nitric oxide cycle. The ratio of reduced (GSH) to oxidized (GSSG) glutathione serves as a key indicator of cellular redox status and overall health.

Glutathione levels decline with age and are depleted in numerous disease states including neurodegenerative diseases (Parkinson's, Alzheimer's), liver disease, chronic infections, and chronic inflammatory conditions. This has led to significant interest in glutathione supplementation. However, oral glutathione has historically been considered poorly bioavailable due to degradation in the GI tract. Alternative delivery methods including liposomal glutathione, IV infusion, nebulized glutathione, and precursor supplementation (N-acetylcysteine) have been developed to address this limitation.

IV glutathione has gained particular popularity in wellness clinics, often administered alongside NAD+ infusions. Clinical evidence for various glutathione supplementation approaches is growing. Studies on liposomal glutathione have shown improved blood GSH levels, and IV glutathione has been investigated for Parkinson's disease, liver disease, and skin lightening. The skin-lightening effect of glutathione, resulting from its ability to shift melanin production from eumelanin to pheomelanin, has driven enormous demand in some Asian markets.