UV radiation helps the body release vessel relaxing nitric oxide, dilating arteries and veins.
"The researchers believe sunlight unlocks nitric oxide stored in skin and widens arteries. Both effects lower blood pressure. Dr Weller will present his findings on Friday at the International Investigative Dermatology conference in Edinburgh. He said: ‘We suspect the benefits to heart health of sunlight will outweigh the risk of skin cancer.’
He said scientists have known for years peoples’ blood pressure is lower in summer than winter. Additionally, research shows populations of countries far from the equator, with less sunlight, have higher blood pressure."

And people who get less UV rays and live further from the equator have higher MS rates. It's time to look at UV rays and MS--another connection to the vasculature.


Want to cut your blood pressure? Sit in the sun: Exposure to rays for just 20 minutes can reduce ris
www.dailymail.co.uk
Edinburgh University researchers found when skin is exposed to sunlight for just 20 minutes, blood vessels release an important chemical called nitric oxide, which acts to lower blood pressure.