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Fennel (Saunf) Seeds: Uses, Benefits, Side Effects, and more!

By Dr Rajeev Singh +2 more


Foeniculum vulgare, commonly known as Fennel, is an aromatic plant belonging to the Apocynaceae family.1 The Foeniculum vulgare, commonly known as fennel, is an aromatic plant belonging to the Apocynaceae family.1 The fennel seeds have a distinct shape, size and colour; they have a long and thin body with a pale green or brown colour. The fennel plant is grown for its seeds, leaves and edible shoots. Fennel seeds are used as kitchen spices around the world. In India, fennel seeds are popularly known as saunf. India is one of the largest exporters of fennel. All its parts are rich in antioxidants. 2

Nutritional value 

Fennel seeds contain range of nutrients helpful for human health. Fennel seeds contain multiple vitamins and minerals, and fatty acids as well.  

fennel seeds

Nutritional component  Value Unit  
Water  8.81 
Energy 345 kcal 
Protein  15.8 
Carbohydrates  52.3 
lipid 14.9 
Fibre  39.8 
Calcium  1200 mg 
Iron, Fe 18.5 mg 
Magnesium, Mg 385 mg 
Phosphorus, P 487 mg 
Potassium, K 1690 mg 
Sodium, Na 88 mg 
Zinc, Zn 3.7 mg 
Copper, Cu 1.07 mg 
Fatty acids, total saturated 0.48 
Fatty acids, total monounsaturated 9.91 
Fatty acids, total polyunsaturated 1.69 
Table 1: Nutritional value of fennel seeds (per 100 grams)3  

Vitamin C, total ascorbic acid 21 mg 
Thiamin 0.408 mg 
Riboflavin 0.353 mg 
Niacin 6.05 mg 
Vitamin B-6 0.47 mg 
Vitamin B-12  µg 
Vitamin A, RAE  µg 
Vitamin C, total ascorbic acid 21  µg 
Table 2: Vitamins present in fennel seeds (per 100 grams)3


Properties of Fennel Seeds

Owning to the presence of a range of phytochemicals and nutrients, fennel may show the following properties.

  • It may be a plant-based source of essential materials like potassium, calcium and phosphorus.2
  • It may act as an antioxidant
  • It may show hepatoprotective (liver protective) property
  • It may show hypoglycaemic (blood sugar lowering) property
  • It may show chemo-preventive (reducing cancer risk) property
  • It may show antitumour (stopping the growth of tumours) property.4

Did you know?

Potential Uses of Fennel Seeds

The potential uses of fennel seeds against many disease conditions are given below.  

Potential Uses of fennel seeds for stomach

Traditionally, fennel has been used as a carminative agent. It may help remove the accumulated gas from the stomach, relieving bloating. Fennel water may also manage flatulence (gas) in infants.1 Fennel seeds may promote the release of digestive secretions necessary for good digestion and absorption of food.2 Fennel extract might be used for its protective activity against stomach damage.4 However, you need to reach out to your healthcare provider if you experience stomach problems.

Potential Uses of fennel (Saunf) seeds as an antibacterial, antifungal, and antioxidant agent

  • Essential oils from fennel seeds may resist the growth of certain foodborne bacteria, including some human pathogenic strains. The seed essential oil has shown antibacterial benefits against several pathogenic bacteria that affect human beings during lab trials.1  
  • The fennel seed essential oil could resist the growth of certain fungi too and showed antifungal activity against the common fungus Candida albicans in lab studies.1
  • The essential oil extracted from the seed shows potent antioxidant and free radical scavenging activity.1 This benefit can be attributed to the presence of phenolic compounds, flavonoids, and fatty acids present in the seeds.4

These activities have been observed in lab-scale studies. With some larger human studies, there is potential for fennel seeds to be used as a medicine to treat infections. Till then, you are advised to consult with a doctor if you encounter any infection.

Potential Uses of fennel seeds for liver

Fennel seed oil could avoid liver damage and act as a hepatoprotective (liver protective) in an animal study. Oral intake of fennel seed oil could also decrease the levels of enzymes associated with liver damage.1,4 Thus, saunf is indeed good for the liver. However, more studies are needed to support the use of fennel for liver problems in humans. Therefore, you are advised to follow the doctor’s advice if you suffer from any liver problems.

Potential Uses of fennel seeds in diabetes

The fennel seed oil could reduce blood sugar levels and showed hypoglycemic activity in diabetic rats during an animal trial. Also, fennel essential oil could improve the pathological changes in the pancreas and kidneys because of diabetes.1,4 Larger human studies could help demonstrate the efficacy of fennel seeds in preventing damage to vital organs due to long-standing diabetes. Therefore, avoid using fennel seeds or other herbal remedies for diabetes without talking to your healthcare provider first.

Potential Uses of fennel seeds in cancer

Fennel seeds could prevent tumours from developing when used in the diet during a study. Fennel seeds could show positive effects against carcinogenesis (cancer formation). Fennel seeds could also show anticancer activity (cancer cell killing), as they kill cancer cells in the mice. Fennel can be used as a natural source of anticancer agents.4 More studies are required to support the use of fennel seeds in cancer, and you are advised not to use any herbal remedy to cure or prevent cancer without consulting your doctor first.

Though there are studies showing the benefits of fennel seeds in various conditions, these are insufficient and there is a need for further studies to establish the true extent of the benefits of fennel on human health. 

Based on my experience, I have observed that fennel extract might possess antifungal properties. Fennel extract might effectively combat different types of fungi, including those causing skin infections including candidiasis.

Dr. Siddharth Gupta, B.A.M.S, M.D (Ayu)

How to Use Fennel Seeds

There are many ways can make use of fennel seeds.  

  • Seeds can be chewed directly as a mouth freshener

After a meal, munching on some fennel seeds can help sweeten and refresh your breath.

  • In teas, you can make fennel tea. Drinking fennel tea regularly may help flush out excess body fluids.2 
  • Gripe water: These delicious seeds are also used as an ingredient in gripe water (to overcome flatulence in infants).1

You must consult a qualified doctor before taking fennel seeds or herbal supplements. Likewise, do not discontinue or replace an ongoing treatment of modern medicine with an ayurvedic/herbal preparation without consulting a qualified doctor. 

In my experience, I have observed that crude fennel extract may have anxiolytic properties, which could potentially help reduce anxiety. This is because fennel contains phytoestrogens, which are plant compounds that can mimic the effects of oestrogen in the body.

Dr. Rajeev Singh, BAMS

Side Effects

There are no reported side effects of fennel owing to its long history of applications.4

However, some people may react differently to common herbs and foods. Therefore, if you experience any side effects after using fennel seeds, you should immediately reach out to your healthcare provider.

Sometimes fennel seeds are promoted as a potential weight-loss aid. The idea that fennel seeds might help with weight loss may have some validity. According to a preliminary study, consuming fennel seeds decreases hunger and considerably lowers overeating at meals. Fennel seeds may be beneficial for persons whose obesity is brought on by food cravings and overeating. I recommend before utilising fennel seeds to aid with weight control, see your doctor.

Dr. Smita barode, B.A.M.S, M.S.


Here are some general precautions you need to follow while using fennel seeds.

  • For nursing mothers: Fennel seeds are safe for lactating and nursing mothers.5
  • For pregnant women: Fennel seeds are possibly safe for pregnant women. But eating a large number of fennel seeds should be avoided.4
  • Before using Saunf for the elderly and children in large quantities, you must consult an Ayurvedic physician to help you get the right dose for your health conditions.

Before using fennel seeds or any other herbs for their properties, you need to consult with your healthcare provider. They will be able to guide you better about the possible precautions you need to take to avoid unwanted side effects.

Sometimes breastfeeding mothers struggle to produce enough milk to fulfil their babies’ needs. That issue may be resolved with fennel seeds. An important component of fennel seeds called anethole mimics oestrogen and may aid in promoting milk production. Consuming fennel seeds may boost prolactin, the hormone that stimulates milk production, according to some research. I suggest ask your doctor if drinking fennel seed tea might help if you’re facing difficulty in producing sufficient milk while breastfeeding.

Dr. Anuja Bodhare, B.A.M.S, M.D (Ayu)

Also Read: Gripe Water for Babies: A Research-Based Guide on Benefits and Usage

Interaction with other Drugs

The possible interactions of fennel seeds with medicines are given below.

  • Fennel seeds should not be taken with certain antibiotic drugs, including ciprofloxacin, levofloxacin and norfloxacin, to name a few.6

Also, if you are taking medication for any health condition, make sure to talk to your healthcare provider about the possible interactions of the drug with other medicines and herbs. This will help you avoid any unwanted effects and interactions.

Also Read: Urad Dal: Uses, Benefits & Side Effects

Frequently Asked Questions  

What is a fennel?

Fennel (Saunf) is a plant grown for its seeds, leaves and edible fruits. Fennel seeds are widely used around the world. 2

What is fennel called in Hindi?

Fennel seeds are called Saunf in India.2

What are the benefits of saunf?

Fennel is useful for digestion. It has shown some benefits for diabetes and cancer. It is also beneficial for the liver and has shown antibacterial, antifungal and antioxidant benefits.1,2,4 However, before using fennel seeds against any disease condition, consult your healthcare provider to get a proper diagnosis and treatment.

What are the uses of fennel seeds?

Fennel tea can be used as a mouth freshener. You can also prepare fennel tea and fennel water.1,2

What are the side effects associated with fennel seeds?

Fennel seeds as no reported side effects. It is safe to use. 4 However, if you experience any mild or severe effects after using fennels seeds, you need to reach out to your healthcare provider immediately.  

What are the benefits of fennel tea?

Using fennel tea regularly may help flush out excess bodily fluids as it may show a diuretic property. Fennel tea may also show carminative activity. It may help in removing gas from the stomach.1,2 You should consult your healthcare provider before using fennel or any herbal tea for its health benefits.

What is fennel water used for?

You can use fennel water to treat flatulence. Gripe water is a preparation of fennel seeds used to treat flatulence (accumulation of gas) in infants.1 However, any herbal remedy should be used after consulting a healthcare provider.

Also Read: Alum: Uses, Benefits & Side Effects


1. Rather MA, Dar BA, Sofi SN, Bhat BA, Qurishi MA. Foeniculum vulgare: A comprehensive review of its traditional use, phytochemistry, pharmacology, and safety. Arabian Journal of Chemistry. 2016 Nov 1;9:S1574–83. Available from: https://www.sciencedirect.com/science/article/pii/S1878535212000792 

2. Fennel: The Multi-faceted Healer. INDIAN CULTURE [Internet]. [cited 2022 Apr 8]. Available from: https://indianculture.gov.in/food-and-culture/spices-herbs/fennel-multi-faceted-healer 

3. FoodData Central [Internet]. [cited 2022 Apr 8]. Available from: https://fdc.nal.usda.gov/fdc-app.html#/food-details/171323/nutrients 

4. Badgujar SB, Patel V v., Bandivdekar AH. Foeniculum vulgare Mill: a review of its botany, phytochemistry, pharmacology, contemporary application, and toxicology. Biomed Res Int [Internet]. 2014 [cited 2022 Apr 8];2014. Available from: https://pubmed.ncbi.nlm.nih.gov/25162032/ 

5. Fennel – Drugs and Lactation Database (LactMed) – NCBI Bookshelf [Internet]. [cited 2022 Apr 8]. Available from: https://www.ncbi.nlm.nih.gov/books/NBK501793/ 

Disclaimer: The information provided here is for educational/awareness purposes only and is not intended to be a substitute for medical treatment by a healthcare professional and should not be relied upon to diagnose or treat any medical condition. The reader should consult a registered medical practitioner to determine the appropriateness of the information and before consuming any medication. PharmEasy does not provide any guarantee or warranty (express or implied) regarding the accuracy, adequacy, completeness, legality, reliability or usefulness of the information; and disclaims any liability arising thereof.

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