Fennel Essential Oil – Everything You Could Hope For in an Herbal Medicine

fennel essential oil re do

Best known for its licorice-like flavor and smell, fennel essential oil can be used internally, topically or via inhalation to improve respiratory function and digestion.

The essential oil is captured by steam distillation of the seeds of the fennel plant and is a key part of aromatherapy and holistic medicine because of its diverse benefits.

The History of Fennel

The first mention of fennel in recorded history dates back to the Roman author, naturalist, and philosopher Pliny the Elder who believed that fennel was eaten by serpents to improve their eyesight after shedding their skin. He began to experiment with fennel in medicines he created in his own apothecary, using it as the backbone of more than 22 different medicines.

In the early 1300s, King Edward I of England used fennel as both a condiment and an appetite suppressant. More than eight and a half pounds of fennel were purchased each month for his personal use. Additionally, when the church mandated specific fasting days, people throughout England used fennel seeds to curb their appetites.

This became such an important tradition in England that when the Puritans sailed to the Americas, they carried fennel in the holds of ships and nibbled on fennel seeds wrapped in handkerchiefs during sermons to curb hunger.1

In medieval times, Europeans believed evil spirits roamed freely as soon as the sun began setting. Whole fennel plants were hung over doorways and fennel seeds inserted into keyholes in an effort to prevent these spirits from entering the home.

Hippocrates, a Greek physician, believed fennel essential oils could improve the milk supply produced by wet nurses. Additionally, ancient Greeks boiled fennel in hot water, producing a beverage designed to help them lose weight. This was consumed before major campaigns of war as well as before the earliest Olympic events.2

The Romans, Chinese, and Hindus used fennel as an antidote to poison. All their royal families had stockpiles of fennel ready to be boiled into a beverage should they become poisoned, and their armies carried fennel as an antidote against poisonous mushrooms or snake bites.

Terpene PropertiesFennel

A variety of terpenes make fennel oil as beneficial as it is, including:

Levels of the compound trans-anethole are particularly high in fennel oil, providing a considerable amount of its antimicrobial and antibacterial properties.3

All of these biochemical agents are bioavailable, meaning they can be rapidly absorbed into the body and making for the quick availability of their benefits.

Uses for Fennel Essential Oil

As mentioned above, the biochemical agents in fennel oil are among some of the most potent. This allows for health benefits like aiding digestion, removing toxic buildup in the blood, and relaxing muscles. Some of fennel essential oil benefits include:

Speed Up Healing of Wounds

A number of the biochemical compounds in fennel oil contribute its antiseptic properties. These properties are beneficial when fennel oil is applied topically to a wound, cleaning and protecting it from infection.

Alleviates Spasms

Spasms are unwanted, uncontrolled, and abnormal contractions that occur in soft tissue throughout the body. Fennel oil begins working upon contact, relaxing nerves and muscles. It doesn’t just calm down current spasmodic attacks but helps prevent future ones.4

Menstruation Regulation

Not only does fennel essential oil help in regulating the menstrual cycle, but it also can also alleviate premenstrual syndrome (PMS) symptoms. Fennel oil provides relief for headaches, cramps, dizziness, and mood swings.

Alleviate Stress and Anxiety

Aromatic use of fennel essential oil through a diffuser can be used for managing stress or reducing anxiety. The oil can also be used for relaxing after a long day and is known to improve mental clarity and focus.5  

Fennel Infographic

Safety and Precautions

Trans-anethole has the potential to significantly increase estrogen production. Therefore, the use of fennel essential oil is discouraged for women who are pregnant or have a history of carcinoma or endometriosis linked to hormone production in the body.

Individuals diagnosed with epilepsy, hemophilia, peptic ulcers, or other bleeding disorders are strongly discouraged from using fennel essential oils. This also includes individuals on medication for diabetes or anticoagulants.

If used improperly, fennel essential oil may produce hallucinations and confusion, convulsions and spasms, skin sensitivity, or nausea and vomiting. Photosensitivity and increased dermatitis risk are associated with overdose of fennel essential oil.6

As with all other essential oils, it is advisable to consult with a primary care physician before using fennel essential oil. This is especially true if you are taking medication or anticipate having surgery in the near future.

Final Thoughts

Whether you use fennel to fight a cough, boost the digestive system, or improve mental clarity and energy, this powerful oil can provide daily benefits. MONQ has made it simple for you to incorporate it into your daily life as fennel is found in our Happy personal diffuser to help bring a little more joy into your life. 

Taylor James

By Taylor James

Taylor is an aromatherapy enthusiast who’s favorite use of essential oils is through a portable diffuser created by MONQ. In her spare time you can find her enjoying nature whether it be on a lake or in a forest.

Favorite MONQ blend: Forest

Show Comments Hide Comments

The above information relates to studies of specific individual essential oil ingredients, some of which are used in the essential oil blends for various MONQ diffusers. Please note, however, that while individual ingredients may have been shown to exhibit certain independent effects when used alone, the specific blends of ingredients contained in MONQ diffusers have not been tested. No specific claims are being made that use of any MONQ diffusers will lead to any of the effects discussed above.  Additionally, please note that MONQ diffusers have not been reviewed or approved by the U.S. Food and Drug Administration. MONQ diffusers are not intended to be used in the diagnosis, cure, mitigation, prevention, or treatment of any disease or medical condition. If you have a health condition or concern, please consult a physician or your alternative health care provider prior to using MONQ diffusers. MONQ blends should not be inhaled into the lungs. Why? It works better that way.





Fennel is widely used around the world, it grows in coastal climates and can also be found on riverbanks. It has very good health benefits; can prevent anemia, treat indigestion, treat constipation, and improves brain functions. Also can be the removal of toxic substances from your body. Fennel is very high with Vitamin C, which can help maintain a healthy immune system.

A Gift Guide for the Enneagram 3

As you continue your holiday shopping, let us help you find the perfect gift for the Enneagram 3, aka the achiever, in your life! An Enneagram 3 is adaptable, driven, success-oriented, and always working toward that next goal. Whether this person is your parent, friend, significant other, or even yourself, there is something for everyone […]

Read More

Dec 09, 2021Essential Oils

A Gift Guide for the Holiday Fanatic

The holiday season is in full swing and we are here to help you find the perfect gift for the holiday fanatic in your life! We all know this person – the one who is counting down the days to each holiday, decorating their entire house, and truly living in the spirit of the season! […]

Read More

Auto-Ship is convenient and fast.