Fennel seeds contain higher concentrations of oils than the fennel plant. For this reason, you only need to use a teaspoon to 1 tablespoon (about 2 to 6 grams) of dried, whole fennel seeds in most recipes.

If you’re making tea with fennel seeds, you’ll only need about 1 teaspoon. To use:

• Crush or grind whole fennels seeds just before you add them to your cooking or tea. This helps to release more of the oil and flavor.
• Add toasted fennel seeds to dishes to give them a sweet, licorice flavor.
• Make a simple tea by crushing a spoonful of fennel seeds and pouring hot water over them.
• Add a tablespoon of the seeds to batter for baked goods.
• You can also try a supplement. Fennel seed is available in capsule form. According to one manufacturer, the recommended dose is 3 capsules (480 milligrams) per day.

Some people use fennel and fennel seeds to make a natural gripe water for older babies. This water may help relieve symptoms of gassiness or colic in infants.