Infrared light is a naturally occurring wavelength just outside the visible light spectrum. Not to be confused with UV light, which is on the opposite end of the spectrum. Infrared is widely recognized for having positive effects on the body. It is a medically proven vasodilator, which means it promotes circulation, increases tissue oxygen levels, enhances cell vitality and regulates body temperature. Hospitals and doctors commonly use infrared light as a therapeutic treatment for conditions ranging from high blood pressure and congestive heart failure to muscle tears and rheumatoid arthritis.