Vitamin D
A fat-soluble vitamin produced in the skin through sunlight exposure and found in a small number of foods.
Educational content only. This content is provided for general educational purposes only and is not medical advice, diagnosis, or treatment. Always consult a qualified healthcare professional before making decisions about your health, exercise, or nutrition. This page intentionally does not provide dosage guidance — speak to a doctor, pharmacist, or registered dietitian about what is appropriate for you.
What the evidence suggests
- Involved in calcium absorption and bone health
- Plays a role in normal immune function
Typical use
Commonly taken with a meal containing fat.
Who may benefit
- People with limited sun exposure
- Those living at higher latitudes during winter months
Who should avoid it
- People with conditions affecting calcium regulation, without medical guidance
Possible side effects
- Excessive long-term intake can raise blood calcium — this is why upper limits exist
Safety notes
- Vitamin D status can be measured with a blood test — that is a far better basis for decisions than guessing.
- Public health guidance varies by country; follow your local recommendation.
Frequently asked questions
Can I get enough vitamin D from food alone?
It is difficult for most people. Sunlight is the main natural source, which is why intake guidance often increases in winter.