Butylated hydroxytoluene (BHT) is a synthetic antioxidant widely used in the food industry to prevent oxidative rancidity in fats and oils. Assigned the E number E321, BHT has been a staple food preservative since the 1950s, protecting processed foods from the degradation that occurs when lipids react with oxygen.
BHT is oil-soluble, heat-stable, and effective at low concentrations, which has made it one of the most practical and economical antioxidants available to food manufacturers. Regulatory agencies including the U.S. FDA and Health Canada permit its use at controlled levels in a wide range of food categories.
How BHT Prevents Oxidative Spoilage
BHT works as a chain-breaking antioxidant that neutralizes free radicals before they can initiate lipid peroxidation. When fats and oils are exposed to oxygen, heat, or light, free radicals form and trigger a cascade of oxidative reactions that produce off-flavors, rancid odors, and nutrient loss. BHT donates a hydrogen atom to these free radicals, effectively stopping the chain reaction.
According to Kemin’s technical documentation, BHT and BHA are preferred by the food industry over natural alternatives like mixed tocopherols (vitamin E) because of their superior stability at the higher temperatures used in frying, baking, and extrusion processing.
Common Food Applications
BHT is used in a broad range of processed foods. Cereals, snack chips, baked goods, and dried meats commonly contain BHT to protect their fat content from rancidity. It is also added to edible oils, shortenings, and margarines at concentrations up to 200 ppm, as specified by regulatory allowances documented by Kemin.
Elchemy’s technical overview notes that BHT preserves not just flavor but also color and nutritional content in treated foods. Vitamins A, D, and E are particularly vulnerable to oxidative destruction, so BHT-treated products retain their nutritional profiles longer during storage and distribution.
Food Packaging and Indirect Contact
Beyond direct addition to food, BHT is incorporated into food packaging materials where it migrates slowly into the product to provide ongoing antioxidant protection. This approach is particularly useful for fatty snack foods packaged in flexible films. Health Canada’s assessment confirms that Canadians are exposed to BHT through both direct food additives and migration from packaging materials.
Canada’s Chemicals Management Plan has proposed that BHT is not harmful to human health at current exposure levels, though the draft assessment noted potential environmental concerns that are still under review.
Non-Food Industrial Uses
Outside the food sector, BHT is used in cosmetics, pharmaceuticals, rubber, petroleum products, and animal feed. In cosmetics, it prevents oxidation of oils and waxes in lipsticks, moisturizers, and sunscreens. The Environmental Working Group (EWG) tracks BHT in its Skin Deep database, noting its widespread presence in personal care formulations.
WebMD reports that BHT has also been investigated for antiviral properties, particularly against herpes simplex virus. The proposed mechanism involves disruption of the viral lipid envelope, though clinical evidence remains limited and BHT is not approved for antiviral use.
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