It's a sunny day, get outside and soak up some rays!
Asked by: Steven Collins, by E-mail
You don’t absorb vitamin D from the Sun, your skin synthesises it in response to sunlight. It’s the UVB portion of the ultra-violet spectrum that’s needed.
This wavelength range is effectively blocked by glass so you can become deficient in vitamin D if you don’t go out and don’t eat enough oily fish or dairy products to compensate.
Read more:
Subscribe to BBC Focus magazine for fascinating new Q&As every month and follow @sciencefocusQA on Twitter for your daily dose of fun science facts.
Luis trained as a zoologist, but now works as a science and technology educator. In his spare time he builds 3D-printed robots, in the hope that he will be spared when the revolution inevitably comes.
Subscribe and try your first 3 issues for just £5. After your introductory period you will pay just £22.99 every 6 issues by Direct Debit. Receive every issue delivered direct to your door with FREE UK delivery.
Discover our latest special editions covering a range of fascinating topics from the latest scientific discoveries to the big ideas explained.
Listen to some of the brightest names in science and technology talk about the ideas and breakthroughs shaping our world.
By entering your details, you are agreeing to our terms and conditions and privacy policy. You can unsubscribe at any time.