PROBLEM TO BE SOLVED: To useα-lipoic acid for the resistance to oxidation or the antioxidation of an oily substance. SOLUTION: The oily substance is selected from edible oils and fats, an unsaturated fatty acid, a carotenoid, a phospholipid and an oil soluble vitamin, and is added withα-lipoic acid to obtain resistance to oxidation. COPYRIGHT: (C)2008,JPO&INPIT