additive
n. countable C1 Advanced US //ˈædətɪv// UK //ˈædɪtˌɪv// ad·di·tive
n. a substance added to food, medicine, or other products to improve them or change how they work.
n. a substance added to a mixture, food, or drug to provide a specific property, such as preservation or flavor.
Salt is a common additive in processed foods.
The label lists several additives that help keep the yogurt fresh.
Regulatory bodies strictly monitor food additives to ensure they do not pose long-term health risks to consumers.
From Late Latin additivus, from the participial stem of Latin addere (“to add”).