You may also have heard infrared is also referred to by its other name -- radiant heat. Any kind of heat you can feel from a distance has been transported by infrared rays. Infrared is quite different from ultraviolet light. It's a form of energy that heats objects directly. This process is called conversion. One reason it's different is because it doesn't have to heat the air in between the heat source and the object.

Without going into the more complicated aspects of physics, infrared is able to penetrate more deeply than other parts of the light spectrum (to a depth of about 1.2 to 1.6 inches) -- and stimulate your body cells.

Now, when light interacts with tissue (or any material), you can think of it as containing those little energy packets called photons. And your skin has the ability to take these photons of infrared light from the sun or from other sources, and use them to stimulate cellular regeneration.

You probably aren't aware that infrared light raises your white blood cell count, improves your cell growth, or causes DNA or protein synthesis in your cells. However, I imagine you do find it interesting that infrared light in this range from 700-2000 nm has been known to: 

-  Produce temporary relief of muscular pain and spasm...       
-  Relieve your mild and occasional joint aches and stiffness...
-  Provide a comforting feeling of penetrating warmth...
-  Stimulate your blood flow and circulation...
-  Invigorate your metabolism...
-  And much more...