man u dont need to actually feel anything for the clen to be working. give it a bit longer, then look at ur results. iv been on it bout 2 weeks, strict diet, and i can rly notice a difference, and yet i dont get any side effects- i never feel warm, i dnt shake, i dnt cramp up. just stick it out, but make sure ur doing ur cardio and drinkn a hell of a lot of water, and GET THE DIET RIGHT!