According to a study published in the Journal of the American Medical Association, Researchers have found that folic acid and other vitamin B supplements do not offer any benefit in lowering cancer risk. On the upside, researchers noted that it won’t increase your risk either.
Dr. Shumin Zhang, study author and an associate professor of medicine at Brigham and Women's Hospital and Harvard Medical School, in Boston said, "In women at risk of cardiovascular disease, we found that folic acid, vitamin B6 and vitamin B12 had no beneficial or harmful effects on the risk of invasive cancer or breast cancer."