For whatever reason, creatine, as well as all other staple supplements, should not be overlooked when "on". It's easy to overlook the little details when we're juicing. If anything, proper supplementation is probably more important on-cycle than off because all sorts of weird stuff happens when on. Your body is able to assimilate nutrients much more rapidly/efficiently. To be on the safe side, load up on creatine, glutamine, anti-oxidants, etc. to maximize your results.