What it is
Food acids for tartness and pH control in dry mixes, gelatin desserts and beverages.
Why your biology objects
Succinic acid is a Krebs-cycle intermediate your mitochondria make every second — genuinely benign. Adipic acid is the outlier: it barely exists in nature and is made petrochemically, the same feedstock as nylon. Benign at food doses, but a pure industrial tell — tartness tuned in a plant, not a kitchen.