PROBLEM TO BE SOLVED: To provide a far-infrared radiation material which contains no harmful heavy metals or radioactive materials for effective action of far-infrared on human body, and a method for using the far-infrared radiation material which reaches small bowel by oral dosage so as to be exposed to far-infrared through the surface of small bowel for health promotion through enhancement of immune strength.SOLUTION: The far-infrared radiation material formed of a single or mixture of ceramic powder (fine grain) and wood or bamboo charcoal powder (fine grain), which has function of far-infrared radiation and is not digested or absorbed in a human body, is mixed with a water-soluble salt. When the far-infrared radiation material passes through small bowel by oral ingestion, the surface of small bowel is exposed to far-infrared for health promotion.【課題】遠赤外線を人体に対し有効に作用させるため、人体に対し有害な重金属や放射能を有する物質を含まない遠赤外線放射物質を、経口服用し小腸に至らしめ、小腸表面へ遠赤外線を当て、免疫力を高めることにより健康増進を図る遠赤外線放射物質の提供、および利用方法。【解決手段】遠赤外線放射機能を有し、人体の消化器官で消化吸収されないセラミックス粉末（微細粒）又は木炭ないし竹炭の粉末（微細粒）の単味または混合物を水溶性の塩と混合した遠赤外線放射物質を提供し、経口摂取することにより、小腸通過時に小腸の表面に遠赤外線を放射せしめ、健康増進を図る。【選択図】なし
