Butylated Hydroxyanisole is used to prevent rancidity in edible fats and oils and in fat-containing foods. This is mainly used as a synthetic antioxidant in food and cosmetics. It is being extensively studied for potential toxicity. This is as an antioxidant and preservative in food, food packaging, animal feed, cosmetics, rubber, and petroleum products. Butylated Hydroxyanisole is a waxy solid used as a food additive with the E number E320.