The Fennel Seed Oil smells like anise oil, and they are both high in anethole, a naturally-occurring chemical used extensively in the food and beverage industry. Fennel seed is often used in cooking. Oil is derived by steam distilling the seeds of the plant. The resultant liquid is yellow to light yellow in color, and it diffuses woody and spicy like essence. It is a natural stimulant that promotes all the necessary functions in the body. Fennel Seed Oil is very useful.