Peppermint (Mentha piperita) has a strong, clean, fresh, minty aroma and is one of the oldest and most highly regarded herbs. Jean Valnet, M.D., studied peppermint’s effect on the liver and respiratory systems. Other scientists have also researched peppermint’s role in improving taste and smell when inhaled. Dr. William N. Dember of the University of Cincinnati studied peppermint’s ability to improve concentration and mental activity. Alan Hirsch, M.D., studied peppermint’s ability to directly affect the brain’s satiety center, which triggers a sensation of fullness after meals.