Researchers have found that ultraviolet-A radiation may help to mobilize nitric oxide into the blood stream, thus widening the blood vessels and lowering blood pressure.
Nitric oxide (NO) is a chemical that is important to humans. It is found in the diet in various leafy greens, like spinach, and is important in almost all organisms. NO, for example, has been shown to play a role in the immune system. Certain immune cells produce NO to help in destroying and removing foreign bacteria.
Additionally, NO plays a role in the cardiovascular system. NO is critical to the widening of the blood vessels, muscle relaxation, and the regulation of blood pressure.