Taurine is one of the cheapest supplements out there, and its probably in your energy drink But WHAT does it do? Taurine is a naturally occurring compound that plays a role in: - Cardiovascular health and blood pressure - Cellular hydration and electrolyte balance - Muscle contraction - Exercise performance and fatigue resistance - Recovery and protects against cellular stress - Nervous system function - Glucose metabolism and insulin sensitivity But why is it in energy drinks? It's NOT a stimulant It interacts with inhibitory neurotransmitter systems, which helps take the edge off caffeine's jittery effects. The idea is to get the wakefullness of caffeine without feeling as cracked-out Take 1-6g daily. It's pretty well tolerated by most. And unlike what you heard in middle school, it doesn't come from bull semen. It was originally discovered in ox bile, which somehow doesn't sound much better.