Healthy Origins® Setria® L-Glutathione Reduced is a naturally derived substance that is a biologically active sulfur amino acid tripeptide compound containing three amino acids: L-Cystene, L-Glutamic Acid and Glycine. Our Setria® brand of L-Glutathione Reduced is a trademark of Kyowa Hakko Kogyo Co., Ltd., and is produced exclusively in Japan using a proprietary fermentation process and is pharmaceutical grade, the highest quality available.*