Peppermint a naturally caffeine free tisane is known for its relaxation properties.Peppermint tea has benefits for your stomach and offers temporary relief from menstrual cramps,stomach cramps,diarrhoea and headaches.Your immune system is taken care of too as peppermint tea contains potassium,calcium and vitamin B, all useful agents in the fight against colds and flu. The relaxing and soothing properties of peppermint is known to be a sleeping aid. Certain studies recommend that pregnant women avoid over using peppermint.