Folic acid is one of the B vitamins that helps break down an amino acid in the blood called homocysteine – which in excess is related to a higher risk of coronary heart disease, stroke and peripheral vascular disease, also called peripheral artery disease or PAD. The American Heart Association does not recommend widespread use of B vitamin supplements to reduce the risk of heart disease and stroke. Instead, a healthy, balanced diet rich in fruits and vegetables, whole grains and fat-free or low-fat dairy products is advised. For folic acid, the recommended daily value is 400 micrograms. Citrus fruits, tomatoes, vegetables and grain products are good sources.