Creatine mono is at that point where it's pretty much a commodity product. Your real concern w/purchasing creatine is that it's manufactured in the U.S. or Canada.
There are no side effects as I think you're defining side effects. You don't get nausious w/some and not others. The worst side effect from a creatine product I've ever witnessed is my friend's bowels going nuts after he'd take creatine. Of course, this is b/c he's a moron and can't read directions. He'd take about 20 grams at a time and was 135 pounds.
Really, just buy stuff that's not made in China. The regulations around manufacturing of such products in Asia is absolutely horrid (read: rat infestations at the plants).
im using O.N. creatine mono and have gotten good results from it, all my lifts have gone up and ive gained some decent size. i would definitely reccommend it.
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