TBHQ stands for tert-butylhydroquinone, which is a synthetic aromatic organic compound and a type of phenol. It is a derivative of hydroquinone, substituted with a tert-butyl group. TBHQ is used as a preservative for unsaturated vegetable oils and many edible animal fats in foods. It does not cause discoloration even in the presence of iron, and does not change flavor or odor of the material to which it is added. Its primary advantage is extending storage life. TBHQ is also used as a fixative in perfumery to lower the evaporation rate and improve stability. It is used industrially as a stabilizer to inhibit autopolymerization of organic peroxides. It is used as an antioxidant in biodiesel. It is also added to varnishes, lacquers, resins, and oil-field additives.
Although TBHQ is generally recognized as safe by the FDA, some studies have raised concerns over the potential health risks posed by TBHQ. Chronic exposure to TBHQ may induce carcinogenicity. However, it is safe as long as it is taken in the recommended amounts.
