Glutathione reduced(GSH) has wide use. Molecular weight is 307.33, m.p. is 189?193°C, its crystal is colorless transparent, thin and long granule, isoelectric point is 5.93. GSH widely exists in animals and plants, There are very high content of GSH in wheat's embryo and animal's liver. GSH is the main cleaner of free radicals in the organism. GSH can also combine with and help discharge toxic compounds, heavy metals and carcinogen which have entered the human body. GSH can also protect the cell membrane.