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Peppermint is a herb and contains no caffeine. Quite often peppermint is consumed after meals as the oils stimulate the flow of bile to the stomach and helps relieve gas pains. Additionally, it has been reported and written that peppermint sweetens the breath and calms the digestive system, relieves heartburn, stomach ache and nausea. An interesting and tingling way to use peppermint is to place a handful of peppermint leaves in your bath water which will lower your body temperature - perfect for cooling fevered skin or after working on a hot summers day.