He points out that people with chronic pain can be at higher risk of side effects from supplements.

It can include the amount you get from both food and supplements.

If you don't like fish, you can get omega-3 from supplements.

But again, it may be best to get calcium from food rather than supplements.

B vitamins from either foods or supplements were found to be protective.

Try to get your calcium from food, rather than from supplements.

You will not want to take in more than 500 mg of calcium at one time, including that from food and supplements.

"The effects from supplements and sun exposure on vitamin D levels in the blood are the same," she says.

It is not clear whether children in more developed countries would benefit from supplements.

But getting vitamin E from supplements doesn't have the same benefit.