“E523” is a food additive, also known as ammonium oxide. This component is often used in the food industry as a preservative, acidity regulator, and stabilizer.
Ammonium oxide can irritate mucous membranes and lead to some side effects, especially in people with sensitive digestion.
E523 is most commonly found in various canned foods, chewing gums, jelly products, and some types of bakery products.