Patients with a history of heart disease will most likely not reduce their risk for developing cancer by taking vitamin B and/or omega-3 fatty acid supplements, a new French analysis suggests. “In the population we studied, we found no beneficial effects of either B vitamins or omega-3 fatty acids taken over five years on cancer occurrence or cancer-related death,” noted study author Valentina Andreeva, who is with the nutritional epidemiology research unit at the University of Paris XIII in Bobigny, France