- Antiseptic: The essential oil of fennel has certain compounds which contribute to its antiseptic properties. By virtue of this property, Fennel Oil can protect wounds from becoming septic.
- Antispasmodic: Spasms can be fatal if not treated properly. Spasms are unwanted and abnormal contractions in respiratory tracts, intestines, muscles, or nerves, resulting in continuous coughing, hiccups, acute pain and pulling sensation in the intestines, cramps, muscle pulls, convulsions, or epileptic attacks.
- Aperitif: Aperitif is a similar property to purgative, but a little milder. An aperitif acts more on the intestinal peristaltic motion, rather than by adding to the bulk of bowel. Fennel oil can help to clear the bowels and cure constipation.
- Carminative: As a carminative, fennel oil makes gases escape from intestines and can give a person immense relief from problems such as indigestion, restlessness, pain in the abdomen, stomach, and chest, as well as lessen hypertension.
- Vermifuge: Fennel oil is an effective worm destroyer. It kills the worms and their spores in the intestines and the excretory tracts.
- Diuretic: Fennel Oil increases the frequency of urination and the quantity of urine, thus helping not only remove excess water, sodium, uric acid, bile salts and other toxic elements from the body, but also lowering blood pressure, cleansing the kidneys and reducing fat.
- Emmenagogue: Women who have problems with irregular, obstructed or painful menstruation can benefit from the emmenagogue property of fennel oil.
- Galactogogue: This oil can play an important role for lactating mothers. It can increase the amount of milk in them by boosting production of a hormone called estrogen.
- Laxative: Fennel oil is a good laxative and benefits in both chronic and acute constipation. However, unlike synthetic laxatives, it has no side effects and can be used regularly.
- Stimulant: The properties of fennel oil like emenagogue, galactogogue and diuretic are due to a single property of this oil, its stimulating quality. Being a stimulant, it promotes all the activities going on inside the body.
- Stomachic: Being a stomachic simply means being a protector of the stomach. Fennel oil helps keep the stomach healthy and functioning properly, and maintains the normal function of all the secretions of digestive acids and bile.
- Splenic: Just as stomachic means something is good for the stomach, splenic means something that is good for the spleen.
- Depurative: Fennel Oil does the work of a detoxifier and purifies the blood, and is therefore considered a depurative.
- Expectorant: Fennel oil has proven to be effective in providing relief from the depositions of mucus and phlegm that lead to congestion of the nasal tract, larynx, pharynx, bronchi and lungs due to cold and viral infection.
- An organic component called Trans Anethole, which present in fennel essential oil, boosts the production of the estrogen hormone. Although this is beneficial for lactating mothers, it is harmful for pregnant women and women with breast cancer or uterine cancer or tumor, since excess estrogen is the main cause of such cancers.
- In heavy doses, it may have narcotic effects and can result in convulsions, hallucinations and mental imbalance. People suffering from epilepsy or with a history of that condition should avoid using fennel essential oil.