TBHQ, or tert-Butylhydroquinone, is a synthetic antioxidant commonly used as a food preservative. It helps prevent the oxidation of fats and oils, which can lead to rancidity and spoilage. TBHQ is often found in processed foods, snacks, and cooking oils, extending their shelf life and maintaining flavor. In addition to its use in food, TBHQ is also utilized in cosmetics and some industrial applications. While it is generally recognized as safe by regulatory agencies like the FDA, excessive consumption may lead to health concerns, so moderation is advised.