Folic Acid and Vitamin B-12 May Help Prevent Heart Disease
Dec. 11, 2000 -- High levels of the amino acid homocysteine have been shown to cause harm by increasing clot formation in the blood vessels in the heart. Recent evidence suggests that vitamins B-12 and folic acid may help prevent heart disease by lowering the body's levels of homocysteine. But until clinical trials are completed in about four years, the jury is still out about not only the damaging effects of the amino acid but also the vitamins' potential benefit in preventing heart disease.
High levels of the harmful amino acid homocysteine may account for up to 10% of deaths from heart disease in men and 6% in women. But "may" is the operative word, and until the verdict is in, the authors of a study published in this week's Archives of Internal Medicine say using folic acid and vitamin B-12 to treat middle-aged people with high levels of homocysteine "may be a prudent option."
The researchers, from the University of Michigan in Ann Arbor, calculated whether it makes more sense to give multivitamins to everyone, or just to people with elevated homocysteine levels. They looked at patients taking 400 mcg of folic acid and 500 mcg of vitamin B-12 daily, and found that it would be most cost-effective if the supplements go to those whose blood tests show elevated levels of homocysteine.
Of course, those who are not necessarily "at-risk" can also benefit from the vitamins. Study author Brahmajee Nallamothu, MD, tells WebMD consumers should try to get enough folic acid and vitamin B-12 through their diets. Nallamothu is a fellow in the division of cardiovascular diseases at the University of Michigan Health System.
Clinical nutrition consultant Linda Rodriguez says the best food sources of folic acid are citrus fruits, tomatoes, vegetables, whole grain and fortified grain products, beans and lentils. Major sources of B-12 include meat, poultry, fish and dairy products. Rodriguez also recommends vitamin B-6, B-12 and folic acid supplements because of their probable effect on homocysteine levels and cardiac disease. Rodriguez is in private practice in Carmel, Calif.