Check a health claim

Paste a message you saw online. We will tell you if it matches a claim we have reviewed.

Result: TRUE

Our reviewed evidence supports this claim.

The skin can make vitamin D when it is exposed to sunlight.

When bare skin is in the sun, your body makes vitamin D.

The NIH Office of Dietary Supplements and the NHS both say the body makes vitamin D from sunlight on the skin.

Reliable sources (2)

Vitamin D - Fact Sheet for Consumers (opens in a new tab) NIH Office of Dietary Supplements (USA) https://ods.od.nih.gov/factsheets/VitaminD-Consumer/
Vitamins and minerals - Vitamin D (opens in a new tab) NHS (UK) https://www.nhs.uk/conditions/vitamins-and-minerals/vitamin-d/

Last verified: 25 October 2026

Always ask a doctor. This tool is for learning. It is not medical advice.

Tips for better results

Check one claim at a time.
Use simple, short words, like the message you saw.
Include the main thing and what it is said to do. For example: “Garlic cures flu.”
If you get UNVERIFIED, try writing it a different way.