This aromatic plant, part of the parsley family, is a complex carbohydrate that provides stable glucose levels which helps prevent mood swings. It helps boost serotonin and endorphin levels.
Read more about 12 Teas That Boost Your Mood.
Crush fennel seeds with the back of a spoon. Bring water to a boil, pour over fennel seeds, cover, and steep for about 7 minutes.