Full of flavour and organically grown. The best peppermint we could find in our search for the best! Caffeine free. Peppermint is an 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, plus it helps heartburn, stomach ache and nausea.