TBHQ (tert-Butylhydroquinone) is primarily used as a preservative in food and cosmetic products. Here are some of its functions and applications:

Food Preservative: TBHQ is commonly used as a food preservative to prevent the oxidation of fats and oils, which can cause them to become rancid and spoil. It is used in a variety of processed foods such as chips, crackers, and fast food.

Antioxidant: TBHQ is a synthetic antioxidant and can help to prevent the oxidation of fats and oils in food and cosmetic products. This can help to extend their shelf life and keep them from spoiling.

Cosmetic and Personal Care Products: TBHQ is used in cosmetic and personal care products such as moisturizers, lotions, and lipsticks to prevent them from spoiling and to extend their shelf life.

Polymer Stabilizer: TBHQ is also used as a polymer stabilizer in the production of polyurethane foam, which is used in a variety of products such as mattresses, furniture, and automotive interiors.

While TBHQ is generally considered safe for consumption and use in small amounts by regulatory agencies such as the U.S. Food and Drug Administration (FDA) and the European Food Safety Authority (EFSA), high doses of TBHQ have been associated with potential health risks. For this reason, there are limits to the amount that can be used in food and cosmetic products.

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