"i can tell you this works and fast. the breakouts are subsiding but not all the way better, but i can see a marked improvement. i&#039;ve definitely felt the light-headedness but not dizziness. interestingly i almost feel an odd combination of light-headedness and euphoria. it does seem to affect my sleep making me wake once or twice a night. the first day i started it i went to the gym and got very lightheaded between lifts. then in the sauna i was literally dripping like a wrung towel which made me nervous and i left. i was pretty nervous and feeling lightheaded for a few hours afterwards as well. going to the the gym for the 1st time since today - hoping this doesn&#039;t happen again."