A method for producing a dry yeast containing S-adenosyl-L-methionine using a yeast having production capability of S-adenosyl-L-methionine, in which a yeast cell concentrate separated from a cell culture liquid of the yeast is subjected to at least one treatment of (1) a treatment of adding a mineral acid to adjust the pH of the concentrate to 1 to 5, and (2) a treatment of heating the concentrate to 40 to 85° C., and then dried, and a composition for oral ingestion containing a dry yeast produced by the production method, having been molded. A method for producing dry yeast cells containing S-adenosyl-L-methionine, which is useful as a water soluble physiologically active substance, in a high concentration with a good yield at low cost, and a composition for oral ingestion formed by molding a dry yeast produced by the production method can be provided.