Glutathione is a natural antioxidant your body makes, and it can influence melanin production which is why it's sometimes marketed for skin brightening. Oral supplements are mostly broken down in the Amazon.com: Glutathione Supplement Active Reduced Form, Enriched with Resveratrol, NAC, Collagen, Hyaluronic Acid, Vitamin C Advanced Antioxidant for Immunity & Detox 150 Capsules : Health & Household Glutathione Injections: The Master Antioxidant for Health & Vitality: Envizion Medical: Wellness Center Understanding Glutathione Deficiency Invigor Medical Hydrogen Water vs. Glutathione (GSH): Comparing Health Benefits Evolved H2O Glutathione Benefits for Gut Health Nikki Yelton RD