You could but at you're own risk. clen removes a lot of taurine from your liver which is needed for proper thyroid function for your t4 and t3 lvls. Obv if your going to do this then supplement taurine with it... Why am i bringing up thyroids? You're cycle can possibly send you into the fat unhappy world of hypothyroidism, maybe not the first time or the second time but you're rolling dice each time and adding things that affect it even more just seems a lot like you're making the chance greater.. With that said anything that may effect your thyroid in any way i would stay away from after a cycle and for pct even if ppl rage that taurine added to a clen cycle negates the entire thing.