Fennel is one of the best herbs to aid digestion. It soothes the digestive tract relieving bloating, flatulence, heartburn and constipation. It's bursting with phytonutrients, vitamin C, manganese, iron and folate. Add to casseroles, salads, and stir fries, or make a tea from steeping it in boiling water. Chew a seed to relieve bad breath.