Nutrition information
Vitamin D
Vitamin D helps the body absorb calcium and supports bone health. It is made in the skin after sunlight exposure and is also found in some foods and supplements; individual needs and deficiency risk vary.
Do not self-diagnose a deficiency. Fatigue, aches, and other nonspecific symptoms have many possible causes. A healthcare professional can advise whether testing or supplementation is appropriate.
Sources of vitamin D
Sources include oily fish, egg yolks, and foods fortified with vitamin D, with availability varying by country. Sun exposure contributes, but season, latitude, skin pigmentation, age, clothing, and time outdoors affect how much the body makes. Avoid deliberate unprotected sun exposure as a way to treat or prevent deficiency; excessive ultraviolet exposure damages skin.
Who may need individual advice?
People with limited sun exposure, some darker skin tones, certain digestive or absorption conditions, or other health factors may have a higher chance of low vitamin D. Risk alone does not confirm deficiency. A clinician can consider history, local guidance, and a blood test when appropriate.
Supplements and safety
Vitamin D supplements can interact with medicines and excessive intake can cause harm, including high blood calcium. Do not take high-dose supplements or combine products without checking the total amount with a healthcare professional or pharmacist. Follow local public-health guidance for age-specific supplementation.