The following are chemical additives found in many pet supplements and food.
It is not meant to be an exhaustive list and so if you see an ingredient you don't recognise on a product label, be sure to research it online.
It's also safe to assume, that when such additives are included, it is for the benefit of the manufacturer concerned and not the pet (either to facilitate production or to create a significantly cheaper product).
Some of the additives are included more than once because they have multiple uses.
E131 Patent Blue V (FD&C Blue 2)
E129 Allura Red AC (FD&C Red 40)
E102 Tartrazine (FD&C Yellow 5)
E110 Sunset Yellow FCF (FD&C Yellow 6)
E320 Butylated hydroxyanisole (BHA)
E321 Butylated hydroxytoluene (BHT)
E282 Calcium propionate
E330 Citric acid
E325 Sodium lactate
E237 Sodium propionate
E310 Propyl gallate
Sodium benzoate - now banned in the UK
E551 Silicon dioxide
E572 Magnesium stearate
Corn / Maize Derivatives:
These modified starch products are used as thickeners, stabilizers, binders and texturizing agents in many pet foods.
E1404 Oxidized starch
E1410 Monostarch phosphate
E1412 Distarch phosphate
E1413 Phosphated distarch phosphate
E1414 Acetylated distarch phosphate
E1420 Acetylated starch
E1422 Acetylated distarch adipate
E1440 Hydroxy propyl starch
E1442 Hydroxy propyl distarch phosphate
E1450 Starch sodium octenyl succinate
Other corn-derived food additives used include corn syrup solids, corn gluten meal, corn protein concentrate, corn oil, and dextrose.
And so many pet foods contain quite a bit of corn in various derivative forms beyond whole corn kernels.
E322 Lecithins (phospholipids)
Mono and diglycerides
Fillers / Binding / Bulking Agents:
Cellulose (wood pulp)
Corn gluten meal
Silicon dioxide ('sand')
Soy protein isolate
Artificial meat flavours
Artificial smoke flavour
Synthetic Amino Acids:
Synthetic Minerals / Trace Elements:
Vitamin A (retinyl acetate)
Vitamin C (E301 Sodium ascorbate)
Vitamin C monophosphate
Vitamin D3 (cholecalciferol)
Vitamin E (alpha-tocopherol)
E410 Locust bean gum (carob gum)
E412 Guar gum
E466 Sodium carboxymethyl cellulose
Chondroitin (from battery chickens / sharks)