Vitamin D
A fat-soluble vitamin involved in several body processes.
Last reviewed 19 Sept 2026
What is it?
Vitamin D is a fat-soluble vitamin produced in the skin on sun exposure and also obtained from some foods and supplements.
Why is it used?
Included in supplements to help maintain adequate levels, particularly where sun exposure is limited.
How does it work?
It contributes to several processes including bone health and immune function.
Common uses
- General wellbeing
- Supporting adequate levels
- Winter months
What does research suggest?
Research suggests maintaining adequate vitamin D is important. Supplementing may help where intake or exposure is insufficient.
Potential benefits
- Supports maintaining adequate levels
- Relevant where sun exposure is limited
Limitations
- Not everyone needs to supplement
- More is not better
- Blood testing can guide need
Safety considerations
Excessive intake can be harmful. Follow labelled doses and consult a healthcare professional.
Who should be cautious?
- Those already taking high-dose multivitamins
- People with certain conditions
Common supplement forms
- D3 (cholecalciferol)
- D2 (ergocalciferol)
Frequently asked questions
Should everyone take vitamin D?
Not necessarily. Needs depend on sun exposure, diet and individual factors; a healthcare professional can advise.
Medical Disclaimer
This content is for general educational purposes only and is not personalised medical advice. Always consult a qualified healthcare professional before making changes to your diet, training or supplement use.