E389, or disodium guanylate, is a food additive used in the food industry as a flavor enhancer. It is used in various products such as soups, snacks, chips, ready meals, and even some types of meat.
Disodium guanylate is added by manufacturers to improve the flavor quality of products and to give them a rich taste.
In general, the additive E389 is considered safe for consumption in reasonable amounts.
However, some studies link disodium guanylate to potential negative health effects, such as allergic reactions in some individuals.