Glutathione Plus capsules, provided by Douglas Laboratories®, contain 50 mg of glutathione in its active reduced form, and 440 mg of N-acetyl-l-cysteine. Glutathione is a tripeptide with antioxidant properties, and N acetyl-l-cysteine is a biologically active precursor for the intracellular glutathione.  Glutathione offers one mechanism for scavenging toxic free radicals.

N-Acetyl-L-Cysteine can help raise intracellular glutathione levels. N-Acetyl-L-Cysteine also appears to have antioxidant properties as such, and is a valuable sulfur
donor for various metabolic needs.