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: The Master Antioxidant Core Med Science Why is Glutathione the Key to Gut Health? Why is Glutathione the Key to Gut Health? Frontiers Glutathione: A Samsonian life sustaining small molecule that protects against oxidative stress, ageing and damaging inflammation