Supplements: Nutrition in a pill?

Supplements aren't for everyone, but older adults and others may benefit from specific supplements.

By Mayo Clinic Staff

The Dietary Guidelines for Americans states that your nutritional needs should be met primarily through your diet. But the guidelines go on to say that for some people, supplements may be a useful way to get nutrients they might otherwise lack.

Before you shop for supplements, get the facts on what they will and won't do for you.

Supplements vs. whole foods

Supplements aren't intended to substitute for food. They can't replicate all of the nutrients and benefits of whole foods, such as fruits and vegetables. Whole foods offer three main benefits over dietary supplements:

  • Greater nutrition. Whole foods are complex, containing a variety of the micronutrients your body needs.
  • Essential fiber. Whole foods, such as whole grains, fruits, vegetables and legumes, provide dietary fiber. As part of a healthy diet, fiber can help prevent certain diseases, such as type 2 diabetes and heart disease, and it can also help manage constipation.
  • Protective substances. Many whole foods are also good sources of antioxidants — substances that slow down a natural process leading to cell and tissue damage. It isn't clear that antioxidant supplements offer the same benefits as antioxidants in food. Some high-dose antioxidant supplements have been associated with health risks.

Who needs supplements?

If you're generally healthy and eat a wide variety of foods, including fruits, vegetables, whole grains, legumes, low-fat dairy products, lean meats and fish, you likely don't need supplements.

But supplements — or fortified foods — might be appropriate in some situations:

  • Women who may become pregnant should get 400 micrograms a day of folic acid from fortified foods or supplements, in addition to eating foods that naturally contain folate.
  • Women who are pregnant should take a prenatal vitamin that includes iron or a separate iron supplement.
  • Adults age 50 or older should eat foods fortified with vitamin B-12, such as fortified cereals, or take a multivitamin that contains B-12 or a separate B-12 supplement.
  • Adults age 65 and older should take 800 international units of vitamin D daily to reduce the risk of falls.

Dietary supplements also may be appropriate if you:

  • Don't eat well or consume fewer calories than needed
  • Are a vegan or a vegetarian who eats a limited variety of foods
  • Follow any other type of diet that restricts an entire category of foods
  • Don't obtain two to three servings a week of seafood, which supplies omega-3 fatty acids for heart health
  • Have limited milk intake due to lactose intolerance or milk allergy, or simply don't consume enough dairy foods
  • Have heavy bleeding during your menstrual period
  • Have a medical condition that affects how your body absorbs or uses nutrients, such as chronic diarrhea, food allergies, food intolerance, or a disease of the liver, gallbladder, intestines or pancreas
  • Have had surgery on your digestive tract and are not able to digest and absorb nutrients properly

Talk to your doctor or a dietitian about which supplements and what doses might be appropriate for you. Be sure to ask about possible side effects and interactions with any medications you take.

Oct. 25, 2017 See more In-depth