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A non-essential group of amino acids, glutathione acts as an antioxidant to fight free radicals and support cellular defenses. It is a small protein that combines three amino acids: cysteine, glutamic acid and glycine. Along with its antioxidant properties, glutathione is also used to support immune system health. Swanson Ultra Maximum Strength L-Glutathione features the trademarked Setria® Glutathione, which is a reduced form of glutathione that is easily recognized and absorbed by the body. The Swanson Premium line includes several supplemental glutathione options, as well as a 95% Natural L-Glutathione Cream for nourished and moisturized skin.