A master of many trades, vitamin D not only aids calcium absorption to support bone health, but evidence suggests it also inhibits cancer growth, boosts immune response, and fights inflammation.

Unfortunately, nearly 70 percent of American adults aren’t getting enough vitamin D, with darker-skinned persons and post-menopausal women most prone to deficiency. Other factors such as milk allergies or a vegetarian diet can contribute to low levels of this nutrient.

While the National Academy of Science endorses the RDA (recommended dietary allowance) for vitamin D, some experts argue for higher amounts.

• Eat vitamin D-rich foods. Eggs, fatty fish such as salmon or tuna, and fortified cereals and dairy products are good sources.

• Supplement. If you’re in northern climates, you may need more vitamin D than your multivitamin can provide. But before you take supplements, talk to your doctor, pharmacist, or nutritionist — too much can be toxic.

Through your diet or a supplement, you can ensure that you get enough vitamin D.