A composition for controlling a blood glucose and a method thereof are provided. The composition comprises a far-infrared ray releasing substance, wherein the composition reduces the blood glucose of a subject via an irradiation of the far-infrared ray releasing substance. In another aspect, the method comprises the steps of providing a far-infrared ray releasing substance having an oxide mineral as a main component, and disposing the far-infrared ray releasing substance in a place close to a subject in an appropriate distance, wherein the subject has an insulin resistance and the appropriate distance is within an irradiation range of the far infrared ray.