disclosed is a stable and safe antioxidant composition which can be used routinely . specifically disclosed is an antioxidant composition which contains one or more compounds selected from the group consisting of d - aspartic acid , derivatives and / or salts thereof . the composition may be used for the purpose of suppressing and / or improving skin conditions . the skin conditions may include , but is not limited to , fine wrinkles , a rough skin , a dry skin , a skin cancer , a skin allergy , an inflammation of the skin and a photosensitive dermatosis . the composition may be used for an external preparation for the skin , a food , and a pharmaceutical product for cataract .