Glutathione is a small protein that is found in every cell of the human body. It is made up of three amino acids: glutamic acid, cysteine, and glycine. Glutathione is involved in many important functions in the body, including detoxification, immune system function, and cellular repair. Intravenous glutathione therapy allows the body to absorb a higher level of glutathione than it would if the amino acid were taken orally. Glutathione has been shown to kill cancer cells by inducing apoptosis (cell death). In addition, glutathione therapy can help to improve quality of life for cancer patients by reducing fatigue and improving cognitive function. Glutathione therapy is generally well-tolerated, with few side effects reported.