Mystery #4Tier 2-3body / skin

How does your skin make vitamin D from sunshine?

Most vitamins come from food, but there's one your body can make for itself, using nothing but sunlight on your skin. How can your skin turn sunshine into something your bones need?

Two girls sitting and chatting on a wooden bench in bright summer sunshine in a garden. — Photo: Si Griffiths, Wikimedia Commons · CC BY-SA 3.0 · via Wikimedia Commons

Your guess

What's your hunch about how your skin could use sunlight to make a vitamin?

There's no single magic word to type, have a go in your own words, then reveal the answer to see how close you got.

Make a guess to unlock the hints and the answer.