Glutathione can be made by the body, while vitamin C cannot. Supplementing your diet with intravenous glutathione and vitamin C may help maximize the benefits from both nutrients. One study found vitamin C supplements increase glutathione levels in human lymphocytes (a type of white blood cell found in the lymphatic system). A different study tracked glutathione levels measured in red blood cells and found that adults taking at least 500 mg of vitamin C supplements daily had almost 50% higher glutathione levels.