I am not certain, but why would you want to risk it, clen isn't that amazing for fat loss, it's a good anti-catabolic drug. Go to the syntrax's website and email the guy, he will tell you if it could harm your client.
well the clen might be for me too. heard good things about it. wanted to see if it was all that. i am heading to SD for the weekend was thinking of stopping by TJ for some gear and wanted info.