PROBLEM TO BE SOLVED: To provide a substance radiating far-infrared rays containing neither heavy metals nor substances having radio activity which are harmful to human body for the purpose of health promotion by sending it by oral dosing to small intestines and radiates far-infrared rays to the surface cells of small intestines to activate them and enhance immunity as the most effective way of acting the far-infrared rays to the human body.SOLUTION: In this method, minute particles of wood charcoal, bamboo charcoal or a mixture of ceramics and wood charcoal or bamboo charcoal which have function of radiating far-infrared rays but are not digested by the human digestive system are suspended in drinking water and dosed orally, so that they radiates far-infrared rays when they pass small intestines to activate the surface cells of small intestines and enhance immunity for the purpose of health promotion.COPYRIGHT: (C)2012,JPO&INPIT【課題】遠赤外線を人体に対し最も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、小腸の表面細胞へ遠赤外線を当て活性化し、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。【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木炭または竹炭あるいはセラミックスと木炭または竹炭の混合物の微細粒を飲料水に混濁させ経口服用し、小腸通過時に小腸の表面細胞に遠赤外線を放射せしめ細胞を活性化し、免疫力を向上させることにより健康増進を図る。【選択図】なし