Stick with creatine monohydrate. "All other forms-Kre-Alkalyn, creatine ethyl ester, creatine pyruvate-are marketing hype," says Stout. Creatine monohydrate is backed up by 600-plus human studies; it works.
Check the country of origin. German creatine is used in most studies; look for the Creapure" seal indicating that it came from Germany's only manufacturer. Creatine made in the United States is also a smart choice.
Powder, tablets, and bars work equally well, says Richard Kreider, Ph.D., a kinesiologist at Texas A&M. Avoid liquid forms, which may not be stable or effective, and capsules, which may not break down well.
Source Citation (MLA 7th Edition)
"CREATINE." Men's Health June 2013: 184.