Omega-3 fatty acids, calcium, and vitamin D have protective effects against cancer.1
Zinc, magnesium, and vitamin B6
(pyridoxine) play a beneficial role against cancer.2
The effect of folic acid supplementation in cancer is controversial.3
Vitamin A supplementation has no beneficial effects and may be harmful.
The role of antioxidants and micronutrients (ie, folic acid, selenium, and omega-3 fatty acids) in cancer is coming under increasing scrutiny.4,