Questions and Answers About Vitamin D

Vitamin D is a fat-soluble vitamin that is important for many functions in the body. This nutrient helps us absorb calcium to build and maintain strong bones throughout life. Muscles need vitamin D to move, and nerves need it to carry messages between the brain and body systems. Researchers have linked vitamin D to roles in maintaining heart health and immune function. Vitamin D may play a role preventing cancer, diabetes and other chronic diseases. Too little vitamin D may play a role in depression and other mental illnesses.

The amount of vitamin D you need depends on your age and other factors. The table below shows the recommended dietary allowances (RDA) for vitamin D.

Key to abbreviations: mcg = micrograms; IU = international units

*Follow the guidance from your health-care provider for infants and throughout life.

Very few foods contain vitamin D. Some foods, such as milk, are fortified with vitamin D. Fortified means that vitamin D was added to the food product. Cereal and orange juice often are fortified with vitamin D. Vitamin D is found naturally in fatty fish such as salmon, tuna and mackerel. Vitamin D is found in small amounts in cheese and egg yolks.

This table shows foods that are good sources of vitamin D as well as some foods that are not good sources of vitamin D. Even though whole grains, fruits and vegetables do not contain any vitamin D, they do contain nutrients that the body needs.

Source of information:
https://ods.od.nih.gov/factsheets/VitaminD-HealthProfessional

The Nutrition Facts labels found on most foods show the amount of vitamin D per serving.

The body can make vitamin D when skin is directly exposed to the sun. Getting sun through a car window will reduce the amount of vitamin D made. People with dark-colored skin also will not make as much vitamin D. However, avoid becoming sunburned; wear sunscreen and take other precautions, especially if you work or play in the sun.

Getting too much vitamin D is possible but not likely. The upper limit of vitamin D is 100 micrograms (4,000 IU) for adults. Many people do not get the recommended 15 micrograms per day, so the possibility of getting too much is highly unlikely. If you do get too much vitamin D, that can lead to a toxicity and cause a number of issues including nausea, vomiting and weakness.

People in the northern parts of the U.S. generally do not make enough vitamin D from sun exposure, especially during winter months. Consider the foods you eat. Consult your health-care provider and/or a registered dietitian to determine if you need a dietary supplement and how much you would need to take.

If you would like more information, please visit
https://ods.od.nih.gov/factsheets/VitaminD-Consumer/.