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Cinnamon
Cinnamomum verum
Cinnamon, derived from the inner bark of Cinnamomum trees, seems harmless but is toxic to cats in several forms. The primary concerns are cinnamaldehyde (the main flavour compound) and coumarin (present in high amounts in cassia/Chinese cinnamon). Cats are especially sensitive because they lack the key liver enzymes needed to safely metabolise these compounds. Even inhaling cinnamon powder can irritate a cat's airways and trigger coughing or choking. Cinnamon essential oils and extracts are far more concentrated than powdered spice and pose a much greater risk.
Important Notes
Symptoms: Drooling, vomiting, diarrhea, and mouth irritation from ingestion; coughing and airway irritation from inhaling the powder; liver damage signs (lethargy, jaundice) with large or repeated exposures.
Essential oils are the highest risk: A few drops of cinnamon essential oil can cause the same harm as ingesting a much larger quantity of ground spice.
Action: Keep cinnamon sticks, powder, and especially essential oils away from cats. Contact a vet if a cat has ingested oil or a significant quantity of spice.
Potentially Toxic Parts
Bark
Possible Symptoms Reported in Cats
Liver failure
Hepatic
Soreness, redness, or chemical burns
Dermal · Rapid (upon contact).
Tremors, shaking, ataxia (walking as if drunk), and seizures
Neurological
Difficulty breathing (Dyspnea) or breathing with the mouth open
Respiratory
Vomiting and excessive dribbling (hypersalivation)
Gastrointestinal
Disclaimer: This summary was compiled from multiple sources and is for informational use only. It is not a diagnosis or treatment plan. Toxicity can vary based on the substance, amount, plant part, and individual cat. If you think your cat may have been exposed to a toxic substance, contact a veterinarian right away.