I just don't use them anymore. I drank RedBull once in a New Year's night and I felt OK, but still not that well to try it again. The next and last time was when I tried to pass a karate exam easier and wanted the "extra kick" this would give me. Well, it made me so thirsty I just felt like dying. So now I just don't drink them anymore.I dislike the taste a lot, don't know why I tried it in the first place anyway