Provided are a process for producing a S-adenosyl-L-methionine-containing composition which is very excellent in a stability by adding at least ascorbic acids or salts thereof to a composition liquid containing S-adenosyl-L-methionine and then drying the above composition liquid or separating and drying a crystallized deposit obtained from the above composition liquid, a S-adenosyl-L-methionine-containing composition obtained by the above production process and a molding obtained from the above composition.