http://www.ted.com/t...your_heart.html
Our bodies get Vitamin D from the sun, but as dermatologist Richard Weller suggests, sunlight may confer another surprising benefit too. New research by his team shows that nitric oxide, a chemical transmitter stored in huge reserves in the skin, can be released by UV light, to great benefit for blood pressure and the cardiovascular system.
Short story even shorter: in the last years people are avoiding sun and supplement vitamin D, because it was widely believed that vitamin D is the only good thing you get from UV exposure. However, new studies have found that UV exposure may release nitric oxide which is stored in the skin and thus lower blood pressure. So, now the question is - how to get all the benefits of sun exposure without the negatives of it?