The substance L-Glutathione is made from cysteine, glutamic acid and amino acid glycine. It is involved in making proteins and chemicals that are needed for the body, building and repairing muscle tissue and aiding in immune system functioning. L-Glutathione may be especially useful for people who suffer from diabetes as well as those who are looking to lose weight. It can improve insulin sensitivity, reduce lipogenesis and decrease belly fat. L-Glutathione also works to eliminate toxins and poisons from the kidneys, intestines, lungs and kidneys.