I have taken Pre workout with no problem while on clen but I also use clen at way way lower dosages then anyone this board that I have seen so far..
20mcg-40mcg daily is all I have ever used or advised and then taking a pre-workout 3-4 hours after last dose of clen for the day has always worked fine for me.
But at such a low dose of clen I have never gotten shakes or jitters for more then 10-20min at a time and have a pretty high tolerance to stimulants. good luck with the clen and like everyone else has said. listen to your body, some people do great with low dose like me and other do horrible when they go too high too fast.
