I was just wondering if anyone else has experienced side effects from thermogenic fat burners. Does having side effects a sign that it's working. My weight loss is going very slow despite dieting, exercising and being on a thermogenic. My side effects include chills, jitters, not being able to concentarte (probably because of the jitters) and worst of all nausea! I'm taking Hot Rox Extreme. Any explainations as to what is causes these side effects?