<;P>;PROBLEM TO BE SOLVED: To provide a new antimutagenic agent which suppresses the activity of a mutagen. <;P>;SOLUTION: The antimutagenic agent contains an extract of Yellow batai (Peltophorum dasyrachis) as an active ingredient and is represented by formula 1. A cosmetic additive comprising the antimutagenic agent is also provided. <;P>;COPYRIGHT: (C)2006,JPO&NCIPI