This worked very well upon even my first use - I felt dizzy within the first few minutes before calming myself down which was a quick reaction. Minutes later my teeth felt odd and kinda of tingly which was interesting, and then only moments later my hands started going numb. It was hard to believe how much of an effect it had in such a short period of time. My lower legs slowly started numbing as well and before I knew it I was not really fully with it. I believe there was a point where i drifted off and then came back but very confused. As it ended, things settled and I was back to normal but more calm and rather impressed. Since that first time, the effects have not been quite as crazy but i still tend to feel the dizziness and numbness come over me when listening.