Glutathione is a cellular antioxidant and detoxifying system including reduced glutathione (GSH), glutathione reductase (GSR), glutathione S-transferase (GST), and glutathione peroxidase (GSH-Px).

Glutathione exerts a natural protective mechanism to prevent free radical damage. It has also been shown to enhance insulin secretion in people with impaired glucose tolerance.

Glutathione supplements are not readily absorbed by the body. Instead, you can boost your liver's production of glutathione by feeding it the right "ingredients"- including foods rich in glutathione like asparagus - the food noted to be highest in glutathione, as well as glutathione precursors (cysteine) with the best source being undenatured organic whey protein.

References

Knight JA The biochemistry of aging Adv Clin Chem 2000;35:1-62, Chen TS, Richie JP, Nagasawa HT, Lang CA Glutathione monoethyl ester protects against glutathione deficiencies due to aging and acetaminophen in miceMech Ageing Dev 2000 Dec 1;120(1-3):127-39.Anderson ME, Luo JL. Glutathione therapy: from prodrugs to genes. Semin Liver Dis. 1998; 18:415-424.Paolisso G, Giugliano D, Pizza G, et al. Glutathione infusion potentiates glucose-induced insulin secretion in aged patients with impaired glucose tolerance. Diabetes Care. 1992; 15:1-7.