Butylated hydroxyanisole (BHA) and the related compound butylated hydroxytoluene (BHT) are phenolic compounds that are often added to foods to preserve fats and oils and keep them from becoming rancid. They are added to food, cosmetics, and packing of products that contain fats to maintain nutrient levels, color, flavor, and odor. BHT is also sold as a dietary supplement for use as an antioxidant. The chemicals are found in an extensive list of products, yet there is concern about their safety. Take a look at the chemical properties of these molecules, how they work, and why their use is controversial.
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