Verdict: No, toxic
Nutmeg is toxic to cats due to the presence of myristicin, a psychoactive compound. Ingestion can lead to central nervous system effects, gastrointestinal upset, and potentially more severe symptoms depending on the amount consumed. Cats should never be given nutmeg.
Myristicin is metabolized in the liver into amphetamine-like compounds, which can cause central nervous system excitation and hallucinogenic effects. It can also inhibit monoamine oxidase (MAO), further contributing to neurotoxicity.
Myristicin