Glutathione: The Master Antioxidant You Can't Just Swallow
Glutathione (GSH) is a tripeptide (glutamate-cysteine-glycine) that serves as the body's primary intracellular antioxidant, detoxification agent, and immune system modulator. It's present in every cell, with the highest concentrations in the liver. The problem: oral glutathione supplementation is largely broken down in the digestive tract before it can be absorbed.
Why You Can't Just Swallow It
Standard oral glutathione is hydrolyzed by peptidases in the gut into its constituent amino acids, which must then be reassembled into glutathione inside cells. This means taking a glutathione capsule doesn't directly raise intracellular levels. Alternative approaches include:
- N-acetyl cysteine (NAC): Provides the rate-limiting amino acid (cysteine) for glutathione synthesis
- Liposomal glutathione: May bypass gut degradation through lipid encapsulation
- S-acetyl glutathione: An acetylated form with improved stability
- Supporting precursors: Glycine + NAC (the "GlyNAC" combination studied in aging research)
What Supports Glutathione Status
Selenium is a cofactor for glutathione peroxidase. Vitamin C recycles oxidized glutathione back to its reduced form. Alpha-lipoic acid regenerates glutathione. Sulfur-rich foods (cruciferous vegetables, garlic, onions) provide precursors. The NRF2 pathway upregulates glutathione synthesis genes.