Vitamin D (25-OH D2/25-OH D3) – DM6 Health


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Vitamin D (25-OH D2/25-OH D3)


What is vitamin D and what is it used for?

Vitamin D is a fat-soluble vitamin that is important for maintaining healthy bones and teeth. It helps the body absorb calcium and phosphorus, which are necessary for bone health. Vitamin D also plays a role in immune function and may have other health benefits, such as reducing the risk of certain types of cancer and diabetes.

How is vitamin D tested?

Vitamin D levels can be measured through a blood test. A healthcare provider will collect a blood sample and send it to a laboratory for analysis.

What is a normal range for vitamin D levels?

The normal range for vitamin D levels can vary depending on the specific laboratory and the method used to test the vitamin. In general, a normal range for vitamin D is considered to be 30-74 ng/mL. However, some experts recommend higher levels for optimal health, with a target range of 50-80 ng/mL.

What can cause abnormal vitamin D levels?

Abnormal vitamin D levels can be caused by a variety of factors, including insufficient sun exposure, a poor diet, and certain medical conditions. People with dark skin, older adults, and those who are obese may be at increased risk of low vitamin D levels.

How is abnormal vitamin D levels treated?

Treatment for abnormal vitamin D levels may involve taking vitamin D supplements, increasing sun exposure, or making changes to the diet to include more vitamin D-rich foods. It is important to discuss treatment options with a healthcare provider.

Are there any risks associated with taking vitamin D supplements?

Vitamin D supplements are generally safe when taken in recommended doses. However, taking too much vitamin D can cause side effects such as weakness, fatigue, and nausea. It is important to follow the dosage recommendations of a healthcare provider or the package label when taking vitamin D supplements.

Can vitamin D levels be affected by certain medications?

Yes, certain medications may affect vitamin D levels. For example, some anticonvulsants, corticosteroids, and cholesterol-lowering medications may interfere with the body's ability to absorb vitamin D. It is important to inform a healthcare provider about all medications being taken, including over-the-counter and herbal remedies, when having vitamin D levels tested.

Can vitamin D levels be affected by lifestyle factors?

Certain lifestyle factors may also affect vitamin D levels. For example, spending too little time in the sun, wearing clothing that covers the skin, and using sunscreen can all reduce vitamin D production. Maintaining a healthy diet that includes vitamin D-rich foods, such as fatty fish, eggs, and fortified foods, and getting regular sun exposure may help to maintain healthy vitamin D levels.


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Mayo Clinic. (2020). Vitamin D test. Retrieved from

Lab Tests Online. (n.d.). Vitamin D (25-Hydroxyvitamin D). Retrieved from

National Institute of Arthritis and Musculoskeletal and Skin Diseases. (2021). Vitamin D and your health. Retrieved from