Is it possible not to feel the side effects from clen? I took clen once before around a year ago and i felt a slight effect the first time at a dosage of 8pills of .o2mg. I prepared for the summer this year by getting some spiropent. I am on my 5th week (2 weeks on, 2 off, 1 back on) and have yet to feel any side effects. Is it possible that i have a good tolerance to clen? I am up to 10x a day. Does anyone have a high tolerance? Will the clen still work even if i do not feel the side effects? Someone help me out. Thanks