Compound Antioxidant Compound Antioxidant An antioxidant that exerts antioxidant effect on oil and fat soluble vitamins.Combination of Ethoxyquinolone (EQ) and butaldehydroxytoluene(BHT). Balanced ratio of these ingredients work in synergistic way and increases antioxidant activity 2-4 times than that of a single antioxidant.