I just got a 10 oz bucket of EAS creatine from my friend. I was wondering though why this stuff is dirt cheap(about $7) and somehting like cell mass is like 4x that much. Ive heard that cheap brands may have impurities that may be harmful. So am i just worrying too much and go ahead and use this stuff up or not use it at all? How about any of you guys have any of you used EAS creatine?? THanks.