I took this new zantrex in the morning when I woke up, and an hour into the gym I feel pumped! I work out usually for 3 hours, only cardio. In two weeks I went from 144 to 138, so it is a big difference to me. Definetly eat or drink with this, DONT mix energy drinks, that was a bad idea. And i think two bottles will help lose at least 15lbs in 2 months or less.