L Glutathione is a tri-peptide - a protein - comprised of one amino acid of glutamic acid, cysteine and glycine. L Glutathione acts as a cellular antioxidant by inhibiting free radical proliferation. Glutathione is a key element of the livers detoxifying process and also the precursor for glutathione peroxidase, a major free radical scavenging enzyme. Glutathione is critical for healthy immune system function. L Glutathione is a powerful antioxidant. It detoxes the liver and is vital for a strong and healthy immune system. Its acts as a cellular antioxidant that inhibitis free radical proliferation and is a key element of the livers detoxifying process. When converted to glutathione peroxidase, it becomes a major free radical scavenging enzyme and boosts immune system function.