There is absolutely no need nor convincing evidence to cycle creatine. The body is capable of storing more creatine than is consumed through the average diet and produced in the body...esspecially in people with more muscel mass than the average human. Creatine is not a hormone and doesn't bind to receptors therefore there is no "feedback" inhibition. Creatine is constantly degraded esspecially during high intensity anaerobic exercise thus there is a constant need to "resuply" the muscles with creatine. The original suggestion to "cycle" was because we simply didn't and really still don't know the pottential neggative effects of long term use of supraphysiological doses of creatine. Though it does now appear quite safe studies of this nature take decades, so the conclusion is still equivocal. Creatine doesn't loose its ability to donate a phasphate to ADP so it never looses its effect.