Glutathione is your body's master antioxidant, but on its own, it can break down before reaching your skin cells. We've formulated our Ursolic Acid & Retinal to use Glutathione encapsulated Source Naturals Reduced Glutathione, 250 mg 60 Tablets Smith's Food and Drug Glutathione is a natural antioxidant your body makes, and it can influence melanin production which is why its sometimes marketed for skin brightening., Oral supplements are mostly broken down in Glutathione or L Glutathione: What is Better for Skin?