Which oil should be avoided for clients with a history of epilepsy?

Fennel essential oil should be avoided for clients with a history of epilepsy due to its potential neurotoxic effects. Certain compounds found in fennel, particularly anethole, can stimulate the nervous system and, in sensitive individuals, may provoke seizures or increase seizure activity. This concern is particularly relevant for those with a predisposed condition like epilepsy.

Rosemary, while it does have stimulating properties, is often mentioned in discussions about epilepsy due to its potential to affect seizure threshold, but it is not as explicitly contraindicated as fennel. Myrrh and cinnamon are generally considered safer alternatives for clients with a history of seizures, thus making fennel the essential oil that is the most clearly advised against in this context. Understanding the specific properties and effects of essential oils helps ensure safe practice in aromatherapy, particularly for individuals with serious medical conditions.