Creatine From Wikipedia, the free encyclopedia For the use of creatine to enhance athletic performance, please see Creatine supplements. Creatine IUPAC name 2-(carbamimidoyl-methyl- amino)acetic acid Other names (α-methylguanido)acetic acid Creatin Kreatin methylguanidinoacetic acid N-amidinosarcosine Identifiers CAS number [57-00-1] EINECS number 200-306-6 SMILES [NH2+]=C(N)N(C)CC([O-])=O Pro..