Folic acid, folate, and folacin are all involved in amino acid metabolism and nucleic acid synthesis. Good dietary sources of folate include leafy, dark green vegetables, legumes, citrus fruits and juices, peanuts, whole grains and fortified breakfast cereals. Recent studies show, if all women of childbearing age consumed sufficient folic acid (either through diet or supplements), 50 to 70 percent of birth defects of the brain and spinal cord could be prevented, according to the U.S. Centers for Disease Control and Prevention (CDC). Folic acid is critical from conception through the first four to six weeks of pregnancy when the neural tube is formed. This means adequate diet or supplement use should begin before pregnancy occurs. Recent research findings also show low blood folate levels can be associated with elevated plasma homocysteine and increased risk of coronary heart disease.