I have tried creatine a few times, currently taking GNC's amplified creatine 189. It's creatine hydrochloride instead of monohydrate, only been a few weeks so I'm not really sure if it works at all yet. I was taking their Amplified Creatine XXX which is a monohydrate and quickly saw noticeable increase in size, quite a bit actually, but seemed to lose some definition and only moderate increases in strength. But as soon as I stopped taking it I did lose all the size and strength, except for what I had actually gained thru weight training. It was very discouraging.