E233, also known as derivatives from bisphenol A or 2,6-di-tert-butyl-4-methylphenol (BHT), is a synthetic antioxidant commonly used as a food preservative. Its primary function is to inhibit the oxidation of fats and oils in food products, which helps maintain freshness and extends shelf life. Oxidation can lead to rancidity, off-flavors, and a decline in nutritional value, which is why food manufacturers often turn to E233 to enhance their offerings.