Infra-red light lies between the visible and microwave portions of the electromagnetic spectrum. Infrared light has a range of wavelengths. "Near infrared" light is closest in wavelength to visible light and "far infrared" or FIR is closer to the microwave region of the electromagnetic spectrum. Far Infrared Rays are a part our natural environment. We are surrounded by far infrared light. Regardless, if we are indoors or out in the direct sunlight.
Everything hot that we feel radiates far infrared waves e.g. the hot water bottles, sunlight, fire, warm sidewalks etc. Heat lamps are often used in medical centres as pain relieves. The therapeutic effect of these lamps specifically comes from FIR. FIR is a 'natural' pain killer.
There is something really quite remarkable about the way far infrared affects the beta rhythm within the body. This vibrational frequency will excite your body's rhythm. So when every cell is excited and heated up, they are performing at a higher "vibration" level. That's when really good things begins to happen within your body.
The warming effect of FIR can stimulate your metabolism, promoting the elimination of some really nasty toxins that accumulate in your cells. Such things as poisons, carcinogenic heavy metals, toxic substances from food processing, lactic acid, free fatty acids, uric acids and subcutaneous fat associated with aging and fatigue. The Bio Disc