Other Name(s):

Anethum Foeniculum, Anethum piperitum, Bari-Sanuf, Bitter Fennel, Carosella, Common Fennel, Fennel Essential Oil, Fennel Oil, Fennel Seed, Fenouil, Fenouil Amer, Fenouil Bulbeux, Fenouil Commun, Fenouil de Florence, Fenouil des Vignes, Fenouil Doux, Fenouil Sauvage, Finnochio, Florence Fennel, Foeniculi Antheroleum, Foeniculum Capillaceum, Foeniculum Officinale, Foeniculum piperitum, Foeniculum Vulgare, Foeniculum Vulgare Fruit, Garden Fennel, Graine de Fenouil, Hinojo, Huile Essentielle de Fenouil, Huile de Fenouil, Large Fennel, Phytoestrogen, Phyto-œstrogène, Sanuf, Shatapuspha, Sweet Fennel, Wild Fennel, Xiao Hui Xiang.


Fennel is a perennial, pleasant-smelling herb with yellow flowers. It is native to the Mediterranean, but is now found throughout the world. Dried fennel seeds are often used in cooking as an anise-flavored spice. But don't confuse fennel with anise; though they look and taste similar, they are not the same. Fennel's dried ripe seeds and oil are used to make medicine.

Fennel is used for various digestive problems including heartburn, intestinal gas, bloating, loss of appetite, and colic in infants. It is also used for upper respiratory tract infections, coughs, bronchitis, cholera, backache, bedwetting, and visual problems.

Some women use fennel for increasing the flow of breast milk, promoting menstruation, easing the birthing process, and increasing sex drive.

Fennel powder is used as a poultice for snakebites.

In foods and beverages, fennel oil is used as a flavoring agent.

In other manufacturing processes, fennel oil is used as a flavoring agent in certain laxatives, and as a fragrance component in soaps and cosmetics.

How does it work?

Fennel might relax the colon and decrease respiratory tract secretions.


Next to red peppers, you can get the most vitamin C from ________________. See Answer

Uses & Effectiveness

Possibly Effective for...

  • Colic in breast-fed infants. Research suggests that giving fennel seed oil can relieve colic in infants 2-12 weeks old. Also, breast-fed infants with colic who are given a specific multi-ingredient product containing fennel, lemon balm, and German chamomile (ColiMil) cry for a shorter period of time than other infants with colic. In addition, giving a specific tea containing fennel, chamomile, vervain, licorice, and balm-mint (Calma-Bebi, Bonomelli) can reduce colic severity in infants.

Insufficient Evidence to Rate Effectiveness for...

  • Swelling of the colon (colitis). Early research suggests that taking an herbal combination of fennel, dandelion, St. John's wort, lemon balm, and calendula can reduce pain along the large intestine in people with swelling of the colon.
  • Constipation. Early research suggests that drinking an herbal tea containing a combination of fennel, anise, elderberry, and senna daily for 5 days can reduce constipation. Also, drinking a tea containing fennel, senna, licorice, orange peel, cassia cinnamon, coriander, and ginger (Smooth Move) for one month can reduce constipation in older people.
  • Painful menstruation. Some research suggests that taking fennel extract four times daily starting at the beginning of a period can reduce pain in girls and young women with painful menstruation called dysmenorrhea. However, other research shows conflicting results.
  • Excess hair on women (hirsutism). Early research suggests that using fennel cream for 12 weeks can reduce hair on women with male pattern body hair.
  • Sunburn. Early research suggests that applying fennel to the skin before ultraviolet (UV) exposure can reduce sunburn.
  • Stomach upset and indigestion.
  • Airway swelling.
  • Bronchitis.
  • Cough.
  • Mild spasms of the stomach and intestines.
  • Intestinal gas (flatulence).
  • Bloating.
  • Upper respiratory tract infection.
  • Other conditions.
More evidence is needed to rate the effectiveness of fennel for these uses.

Natural Medicines Comprehensive Database rates effectiveness based on scientific evidence according to the following scale: Effective, Likely Effective, Possibly Effective, Possibly Ineffective, Likely Ineffective, and Insufficient Evidence to Rate (detailed description of each of the ratings).

Side Effects

Fennel is LIKELY SAFE when taken by mouth in the amounts commonly found in food. For the most part, there is not enough evidence to know whether it is safe for adults when used in medicinal amounts.

Some people can have allergic skin reactions to fennel. People who are allergic to plants such as celery, carrot, and mugwort are more likely to also be allergic to fennel. Fennel can also make skin extra sensitive to sunlight and make it easier to get a sunburn. Wear sunblock if you are light-skinned.


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Special Precautions & Warnings

Pregnancy and breast-feeding: Not enough is known about the safety of using fennel during pregnancy. It's best to avoid use.

During breast-feeding, fennel is POSSIBLY UNSAFE. It's been reported that two breast-feeding infants experienced damage to their nervous systems after their mothers drank an herbal tea that contained fennel.

Children: For the most part, there is not enough evidence to know whether it is safe for children when used in medicinal amounts. However, researchers have studied a combination product (ColiMil) for colic that contains fennel, lemon balm, and German chamomile. This product seems to be safe in infants when used for up to one week.

Allergy to celery, carrot or mugwort: Fennel might cause an allergic reaction in people who are sensitive to these plants.

Bleeding disorders: Fennel might slow blood clotting. Taking fennel might increase the risk of bleeding or bruising in people with bleeding disorders.

Hormone-sensitive condition such as breast cancer, uterine cancer, ovarian cancer, endometriosis, or uterine fibroids: Fennel might act like estrogen. If you have any condition that might be made worse by exposure to estrogen, do not use fennel.


Birth control pills (Contraceptive drugs)Interaction Rating: Moderate Be cautious with this combination.Talk with your health provider.

Some birth control pills contain estrogen. Fennel might have some of the same effects as estrogen. But fennel isn't as strong as the estrogen in birth control pills. Taking fennel along with birth control pills might decrease the effectiveness of birth control pills. If you take birth control pills along with fennel, use an additional form of birth control such as a condom.

Some birth control pills include ethinyl estradiol and levonorgestrel (Triphasil), ethinyl estradiol and norethindrone (Ortho-Novum 1/35, Ortho-Novum 7/7/7), and others.

Ciprofloxacin (Cipro)Interaction Rating: Moderate Be cautious with this combination.Talk with your health provider.

Ciprofloxacin (Cipro) is an antibiotic. Fennel might decrease how much ciprofloxacin (Cipro) the body absorbs. Taking fennel along with ciprofloxacin (Cipro) might decrease the effectiveness of ciprofloxacin (Cipro). To avoid this interaction, take fennel at least one hour after ciprofloxacin (Cipro).

EstrogensInteraction Rating: Moderate Be cautious with this combination.Talk with your health provider.

Large amounts of fennel might have some of the same effects as estrogen. But fennel isn't as strong as estrogen pills. Taking fennel along with estrogen pills might decrease the effects of estrogen pills.

Some estrogen pills include conjugated equine estrogens (Premarin), ethinyl estradiol, estradiol, and others.

Medications changed by the liver (Cytochrome P450 3A4 (CYP3A4) substrates)Interaction Rating: Moderate Be cautious with this combination.Talk with your health provider.

Some medications are changed and broken down by the liver. Fennel might decrease how quickly the liver breaks down some medications. Taking fennel along with some medications that are broken down by the liver can increase the effectiveness of some medications. Before taking fennel, talk to your healthcare provider if you are taking any medications that are changed by the liver.

Medications that might be affected include certain heart medications called some calcium channel blockers (diltiazem, nicardipine, verapamil), chemotherapeutic agents (etoposide, paclitaxel, vinblastine, vincristine, vindesine), antifungals (ketoconazole, itraconazole), glucocorticoids, alfentanil (Alfenta), cisapride (Propulsid), fentanyl (Sublimaze), lidocaine (Xylocaine), losartan (Cozaar), fexofenadine (Allegra), midazolam (Versed), and others.

Medications that slow blood clotting (Anticoagulant / Antiplatelet drugs)Interaction Rating: Moderate Be cautious with this combination.Talk with your health provider.

Fennel might slow blood clotting. Taking fennel along with medications that also slow clotting might increase the chances of bruising and bleeding.

Some medications that slow blood clotting include aspirin, clopidogrel (Plavix), dalteparin (Fragmin), enoxaparin (Lovenox), heparin, ticlopidine (Ticlid), warfarin (Coumadin), and others.

Tamoxifen (Nolvadex)Interaction Rating: Moderate Be cautious with this combination.Talk with your health provider.

Some types of cancer are affected by hormones in the body. Estrogen-sensitive cancers are cancers that are affected by estrogen levels in the body. Tamoxifen (Nolvadex) is used to help treat and prevent these types of cancer. Fennel seems to also affect estrogen levels in the body. Taking fennel along with tamoxifen might decrease the effectiveness of tamoxifen (Nolvadex). Do not take fennel if you are taking tamoxifen (Nolvadex).


The following doses have been studied in scientific research:


  • For colic in breast-fed infants: a specific multi-ingredient product containing 164 mg of fennel, 97 mg of lemon balm, and 178 mg of German chamomile (ColiMil) twice daily for a week.

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