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 Glutathione Injection Before and After: What Expect In Results Intravenous glutathione should not be mismatched with ozone as an antioxidant therapy ScienceDirect What to Avoid When Taking Glutathione: Expert Recommendations for Safe TALSEN CHEM