Glutathione is a tripeptide, consisting of the three amino acids, cysteine, glutamic acid, and glycine. Glutathione is found and manufactured in every cell in the body, but is found in highest concentrations in the heart, muscle tissue and the liver. Glutathione is critical for healthy immune system function and necessary for various liver detoxification processes. Glutathione also acts as an antioxidant that acts to prevent oxidative stress in most cells and help to trap free radicals that can damage DNA and RNA.

Articles on Glutathione:

http://en.wikipedia.org/wiki/Glutathione