As an anesthesiologist and lifetime drug free fitness enthusiast I'm always looking for a natural pre-workout supplement to help me focus and maximize my workouts. I have found Go Big to align with my fitness goals and enable me to maximize my physical and mental effort naturally. I don't worry about chemicals or proprietary blends. The taste is great. There is no crash after. I also utilize it when late on call to care for patients undergoing critical procedures where focus is of utmost importance.