Fennel Tea: How to Make It and What It Does

Fennel tea is a fennel-seed infusion that takes at least 2 hours and 5 minutes to prepare and yields about 1 liter (4¼ cups).

For another recipe, try the ai detox recipe generator.

What is fennel tea?

Fennel tea is water infused with fennel seeds, which have a naturally sweet, licorice-like flavor. This recipe makes an unsweetened, cold-steeped version rather than a hot brew.

Fennel tea is one kind of herbal detox tea, although the name does not mean it removes toxins. Plain fennel tea is naturally caffeine-free and can add flavor to your usual water intake without added sugar.

The finished drink is strained, so it does not contain all the nutrients present in the whole seeds. Its flavor and nutrient content can vary with the seeds and steeping time.

How do you make fennel tea?

Prep time: 5 minutes
Steep time: 2–4 hours in the refrigerator
Total time: At least 2 hours and 5 minutes
Yield: About 1 liter (4¼ cups)

Ingredients

2 g whole fennel seeds (about 1 teaspoon, or 1/48 cup)
1,000 mL drinking water (about 4¼ cups)

Instructions

Clean your hands, a pitcher and a utensil for crushing the seeds.
Crush the fennel seeds lightly to release their flavor.
Add the seeds and water to the pitcher, then cover it.
Refrigerate for 2–4 hours. Taste after 2 hours and steep longer if you prefer a stronger flavor.
Strain out the seeds and serve the fennel tea chilled.

Keep the fennel tea refrigerated and drink it within 24 hours for the best flavor. Discard it after 2–3 days, or sooner if it becomes cloudy, slimy or sour-smelling. Do not leave it at room temperature for more than a few hours.

The exact amount of nutrients that moves from the seeds into the water is unknown. Nutrient values for whole fennel seeds cannot be used as the nutrient values for strained fennel tea.

What does fennel tea do for detox?

Fennel tea provides water, which supports normal hydration. Your liver and kidneys do most of your body’s detoxification; the lungs and gut also help eliminate waste, while sweat removes only trace amounts.

There is no established evidence that fennel tea cleanses the body or speeds up detoxification. Its practical benefit in this context is as a drink you may enjoy as part of your usual fluid intake, not as a substitute for medical care.

Research on a fennel ingredient or extract should not automatically be treated as evidence for this strained drink. The amount and form of fennel in a study may differ from what ends up in the tea. Read more about fennel tea benefits.

How much fennel tea should you drink, and when?

There is no established detox dose or proven best time to drink fennel tea. You can have a serving when it suits you, including with a meal if you enjoy the flavor; it does not need to be taken on an empty stomach.

There is also no need to drink the whole batch at once. Pour a serving and keep the rest refrigerated, following the storage guidance above. If a clinician has advised you to limit fluids, count fennel tea toward that limit.

For more context, see how much fennel tea per day, can you drink fennel tea every day, and the best time to drink fennel tea.

What are the side effects of fennel tea?

Fennel can cause an allergic reaction, particularly in people sensitive to fennel or related plants such as celery and carrot. Stop drinking it if you develop a rash or other concerning symptoms. Seek urgent medical help for trouble breathing, or swelling of the lips, tongue or throat.

If you are pregnant or breastfeeding, or want to give fennel tea to a child, ask a healthcare professional first: safety information for regular medicinal use is limited. Check with a clinician or pharmacist before using it regularly for a health concern if you take medication or have a medical condition.

Use culinary fennel seeds rather than fennel essential oil, which is much more concentrated and is not interchangeable with the seeds. For more detail, see fennel tea side effects.

Fennel tea FAQs

Can you use ground fennel seeds?

Ground fennel can make the tea cloudier and harder to strain than whole seeds. Use the same weight rather than assuming a teaspoon of ground fennel weighs the same as a teaspoon of whole seeds.

Do you have to crush the seeds?

Lightly crushing the seeds helps release their flavor into the water. You can leave them whole, but the finished tea may taste milder.

Can you sweeten fennel tea?

Yes. Add a little sugar or another sweetener after straining if you prefer, bearing in mind that it changes the drink’s nutritional content. Taste the tea first: fennel has a naturally sweet flavor.