iStock/ThinkstockBy DR. JENNIFER ASHTON, ABC News Senior Medical Contributor

You may be use to hearing we need more vitamin D. The nutrient is crucial for strong bones and may play a role in other health conditions.

But now, many experts are saying there’s too much needless testing and too many people taking too many pills for a problem that too few truly have.

Here’s my prescription: There are certain groups at risk for vitamin D deficiency — these include people with dark skin, the elderly, the obese, people who do indoor sports or rarely go outside.

If you do indeed have a deficiency, there are vitamin D-fortified foods and supplements you can take or you can get it from about 15 minutes a day of direct sunlight, though dermatologists are quick to point out that this comes with the risk of sun damage and possibly even skin cancer.

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