Vitamin B-12 - Mayo Clinic
www.mayoclinic.org › drugs-supplements-vitamin-b12Jul 17, 2021 · Research on the use of vitamin B-12 for specific activities and conditions shows: Heart and blood vessel disease. Researchers had previously believed that vitamin B-12, when combined with folic acid (vitamin B-9) and vitamin B-6, might prevent diseases of the heart and blood vessels by reducing the levels of an amino acid in the blood (homocysteine).