Glutathione is a substance naturally produced by the liver that is also present in some foods (fruit, vegetables and meats). From a chemical point of view it is a tripeptide formed by the amino acids cysteine, glycine and glutamate. S-acetyl glutathione (SAG) is the new superior alternative to reduced glutathione intake. Several studies have in fact confirmed that, in this form, it is better absorbed through the intestinal wall, since its acetyl bond prevents oxidation and allows the molecule to pass diffusely into the cell after intestinal absorption. This acetylation prevents the degradation of glutathione. In this form, the basic properties of glutathione are well preserved and increased and allow: to participate in the correct functioning of mitochondrial function; to ensure protection against induced DNA damage; to contribute to the elimination of heavy metals (mercury, lead, cadmium …), as well as organic toxins, protecting the magnesium level in the blood; to participate in protection against certain chronic diseases (herpes, HIV, Lyme disease, fibromyalgia, chronic candidiasis).