<;P>;PROBLEM TO BE SOLVED: To provide a method for safely generating hydrogen sulfide gas in the stomach including using a substance used as health food product and having no problem in safety; and to provide health food product and drug medicine each enabling generation of hydrogen sulfide gas in the stomach. <;P>;SOLUTION: The method for safely generating hydrogen sulfide gas in the stomach includes making a substance made of an acid stronger than the hydrosulfuric acid and hydrogen gas-occluded hermatype calcium react with stomach acid to generate hydrogen sulfide gas in the stomach. The substance made of the acid stronger than the hydrosulfuric acid comprises a lactic acid oligomer. The substance made of the acid stronger than the hydrosulfuric acid, and the hydrogen gas-occluded hermatype coral calcium, are orally taken at the same time. The substance made of the acid stronger than the hydrosulfuric acid suitably comprises the lactic acid oligomer. <;P>;COPYRIGHT: (C)2011,JPO&INPIT