When it comes to glutathione, purity = performance That's why Glutone 1000 uses Setria L Glutathione, crafted in Japan through a patented bio fermentation process. What makes Setria special? 99.5% purity Amazon.com: Clinical Trial Backed Glutathione 250 mg, Setria Reduced L Glutathione, 6 Month Human RCT (European Journal of Nutrition 2015), Antioxidant & Immune Support, 60 Vegetarian Capsules Utzy Naturals : Health & Household Codeage Liposomal Setria Glutathione Erewhon Healthy Origins Setria L Glutathione Reduced 500 mg 60 Capsules L Glutathione Reduced Setria 500 Mg, Healthy Origins Professional Supplement Center Emerald Labs Setria L Glutathione 250 mg 30 Vegetable Capsules