It's not an uncommon theory to assume that everything good for you will also be good for your cat. Some pet parents use essential oils to help with their cat's digestive systems as well as to tackle skin conditions like extreme shedding or hair balls. Peppermint oil in particular has gained traction for its ability to remove fleas, thanks to its naturally powerful properties as a pesticide. Cats, however, love to lick their fur as an act of self-grooming, so anything you place near your cat should always be safe enough for them to (potentially) consume.