Ingredient library

Worth knowing · Allium

Onion

Also appears on labels as: onion powder, onion extract, dried onion, dehydrated onion, onion juice, shallot

Onion in any form the label prints it: dried, powdered, or extracted for flavor.

Watched ingredients get highlighted on every product panel you open.

Where it comes from
Vegetable dehydration or extraction.
Why it's in the product
Flavor, almost always in a wet food or a gravy where it stands in for a savory note.
Safety and toxicity
The allium toxin story is the same as garlic's, and onion carries more of it. Thiosulfates damage red blood cells and can cause hemolytic anemia; onion is roughly three to five times more potent than garlic by weight. Commercial flavoring amounts are far below a toxic dose, and no recall has ever turned on onion extract in a pet food. We flag it anyway, because it is the one line on a panel where the ingredient is a known toxin and only the dose is keeping it safe.
Interactions and who should be careful
Cats are markedly more sensitive than dogs, and onion powder is the form most often implicated in feline cases. Japanese breeds including Akitas and Shiba Inus carry a red cell trait that lowers their threshold further. Cumulative dosing matters too: the damage is oxidative and adds up across meals.

General reference, not veterinary advice. Dose, breed, and existing conditions change the answer, so talk to your vet before changing what your pet eats. Think we got this wrong? Tell us and we log it publicly.

Found in 2 scored products

We flag it by name on 2 of them. Lowest scores first.