Dietary supplements—Vitamin D and omega-3 fatty acids—do not have an affect on cancer prevention

The use of dietary supplements in the United States is very common.  In the past decade, the number of people taking Vitamin D has increased 400% and omega-3 fatty acids 1000%.  These products have been thought to possibly protect against heart disease and cancer.  However, in two large randomized trials where patients either took the supplement or a placebo, neither Vitamin D not fatty acids showed any benefit against cardiac or cancer outcomes.  Vitamin D still does contribute to overall bone health and mineral growth.

Click to learn more from National Cancer Institute