Optimal Liposomal Glutathione by Seeking Health provides 500 mg of reduced glutathione per serving. Glutathione is an important antioxidant that is naturally found in every cell in the body, providing protection from free radicals and peroxides. Within the body, glutathione is produced from three amino acids: L-cysteine, glycine and L-glutamic acid. Glutathione is present in the body in two forms: reduced and oxidized. The oxidized form can be recycled and converted back into the reduced form via important enzymatic reactions within the body. Glutathione is also present in many dietary sources, though its amino acid precursors are more abundant in foods. This antioxidant is essential in helping the body's cellular defenses and immune system function at full capacity.