TBHQ And Citric Acid In Propylene Glycol

TBHQ (tertiary butylhydroquinone) is a synthetic antioxidant. Citric acid is a weak organic acid found naturally in citrus fruits. TBHQ is often dissolved in propylene glycol, a solvent, to make it easier to use in food processing.

TBHQ and citric acid are used together as antioxidants to prevent oils and fats in foods from going rancid. They help extend the shelf life of products containing fats and oils. They are commonly found in baked goods, fried snacks, and some processed meats.

TBHQ is approved by the FDA as a food additive. It is also generally recognized as safe (GRAS) by the FDA for use as an antioxidant. Both the Joint FAO/WHO Expert Committee on Food Additives (JECFA) and the European Food Safety Authority (EFSA) have evaluated TBHQ. Some studies in animals have raised questions about potential health effects at very high doses, but regulatory bodies consider it safe at levels typically used in food. Evidence is mixed regarding long-term effects.