Cats are more vulnerable than many other pets to essential oil exposure because they can have difficulty metabolizing certain compounds in these products. Veterinary and poison-control guidance warns that essential oils can be toxic to cats through skin contact, ingestion, and inhalation, including from diffusers.
Because of that, it is not a good idea to present a list of “best” essential oils for cats as generally safe. Even oils sometimes mentioned online may be risky depending on the oil, the concentration, how it is used, your cat’s age, health status, and whether the cat has direct exposure. The safest recommendation is to avoid using essential oils on or around cats unless your vet specifically advises it.
If a cat is exposed and develops drooling, vomiting, wobbliness, breathing problems, lethargy, or irritation, seek veterinary help promptly. Poison-control resources for pets specifically advise contacting your veterinarian, ASPCA Animal Poison Control, or Pet Poison Helpline right away if poisoning is suspected.