Ethoxyquin

Caution

Verdict

Caution — a regulated preservative, not an acute household toxin.

Also called: preservative e324
Source: ASPCA · Verified 2026-08-13

Verdict

Ethoxyquin keeps fats from going rancid in some dry foods and fish meals. It is tightly limited in pet food. It is not something to panic-search at 2 a.m. after one meal. Chronic-diet questions belong with your veterinarian, not with an emergency clinic, unless the cat is actually sick.

Symptoms to watch for

  • none typical from labeled pet-food use

What to do

No emergency for a listed preservative on a complete cat food. Ask your vet if you want to switch foods.