Something I supplemented a few times with in my body building days, roughly 10 years ago. It's one of those supplements that works well for some and not others. For me it was amazing as far as weight and strength gains were concerned. I gained 8kg over 4 weeks(about 1/2 of it was water weight) my strength went up 20% on lifts.

I've wondered over the years how it would effect me now, I have border line high blood pressure so it doesnt seem worth risking in any amount. The problem is if i was to risk it and end up getting high blood pressure it's not something you can just wait a few hours to clear your system. It can take over a week to flush out the exessive levels of creatine. You can get creatine in your diet through red meat anyway, obviously nowhere near what you would get from a supplement.