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特許 係属中 PROBLEM TO BE SOLVED: To provide a method for stably and efficiently producing a composition highly including 1-deoxynojirimycin. ; SOLUTION: The invention is a method for producing a composition including 1-deoxynojirimycin from mulberry leaves, substantially the mulberry leaves collected the leaves growing on the branches within the area less than 50 cm from the branch top of mulberry tree.