I received a sample of this product from a friend and I love it. I work a lot but try to avoid sugary energy drinks. I also can not drink black coffee so whenever I do grab one I feel like it is a meal worth of calories. This was perfect to add to my water without making me feel like i was doing harm to my body! It tasted great and kept me energized all day. I never felt anxious of jittery just alert and awake.