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I've used pure creatine before. I've noticed some results, but it did make me cramp up more often.
Just to answer your question. I've used GNC's pure creatine. That worked. And just as Plan9 suggested, don't waste your money on pre-mixed crap i.e Creatine Fizz Fuel - that shit was a waste of money.
oh, and I probably won't use it again b/c it hasn't been researched well.
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