Yerba Mate contains a chemical compound called Mateine, which is thought by many authorities to be identical to caffeine with one exception, it doesn't cause jitters. Like caffeine, it has a stimulating effect on metabolism. A faster metabolism not only means you burn more calories, it means you turn more calories into energy. As it stimulates the metabolism into turning more calories to energy, it simultaneously soothes the nervous system. You feel less nervous and anxious, and you're better able to resist physical and mental fatigue. Athletes drink it to improve physical endurance and performance; students and executives drink it to improve concentration and alertness; families drink it to improve their overall health and to protect against stress. Start enjoying its benefits today. Certified organic.