What's up people so i've been on clen now for the last week, and its all going great lost 4 kilos since monday. But sometimes i feel sick after doing cardio, like last night i increased the dose a lil bit and increased cardio aswell by 10 minutes, 1 hour later i was chucking my guts out, happened to me again a few months ago when i had just started clen. Jus want to verify that this is an effect of the clen or maybee something else. All up in my lifetime i've done 3-4 weeks of clen and only thrown up off it twice.