section_path: Prevention/Dietary supplements
section_name: Dietary supplements
paragraph_text: Dietary supplements
  
  While a healthy diet is beneficial, the effect of antioxidant supplementation (vitamin E, vitamin C, etc.) or vitamins has not been shown to protect against cardiovascular disease and in some cases may possibly result in harm. Mineral supplements have also not been found to be useful. Niacin, a type of vitamin B3, may be an exception with a modest decrease in the risk of cardiovascular events in those at high risk. Magnesium supplementation lowers high blood pressure in a dose-dependent manner. Magnesium therapy is recommended for people with ventricular arrhythmia associated with torsades de pointes who present with long QT syndrome, and for the treatment of people with digoxin intoxication-induced arrhythmias. There is no evidence that omega-3 fatty acid supplementation is beneficial. A 2022 review found that some dietary supplements, including micronutrients, may reduce risk factors for cardiovascular disease.