Creatine

Creatine
	Skeletal formula of neutral form of creatine
	Skeletal formula of one of the zwitterionic forms of creatine
	Ball and stick model of one zwitterionic form of creatine
Names
	Systematic IUPAC name 2-[Carbamimidoyl(methyl)amino]acetic acid
	Other names N-Carbamimidoyl-N-methylglycine; Methylguanidoacetic acid; N-amidinosarcosine
Identifiers
CAS Number	57-00-1 ;
3D model (JSmol)	Interactive image;
Beilstein Reference	907175
ChEBI	CHEBI:16919 ;
ChEMBL	ChEMBL283800 ;
ChemSpider	566 ;
DrugBank	DB00148 ;
ECHA InfoCard	100.000.278
EC Number	200-306-6;
Gmelin Reference	240513
KEGG	C00300 ;
MeSH	Creatine
PubChem CID	586;
RTECS number	MB7706000;
UNII	MU72812GK0 ;
CompTox Dashboard (EPA)	DTXSID1040451 ;
	InChI InChI=1S/C4H9N3O2/c1-7(4(5)6)2-3(8)9/h2H2,1H3,(H3,5,6)(H,8,9) Key: CVSVTCORWBXHQV-UHFFFAOYSA-N ;
	SMILES CN(CC(=O)O)C(=N)N;
Properties
Chemical formula	C4H9N3O2
Molar mass	131.135 g·mol−1
Appearance	White crystals
Odor	Odourless
Density	1.33 g/cm3
Melting point	255 °C (491 °F; 528 K)
Solubility in water	13.3 g L−1 (at 18 °C)
log P	−1.258
Vapor pressure	0.001 mmHg
Acidity (pKa)	3.429
Basicity (pKb)	10.568
Isoelectric point	8.47
Thermochemistry
Heat capacity (C)	171.1 J K−1 mol−1 (at 23.2 °C)
Std molar; entropy (S⦵298)	189.5 J K−1 mol−1
Std enthalpy of; formation (ΔfH⦵298)	−538.06–−536.30 kJ mol−1
Std enthalpy of; combustion (ΔcH⦵298)	−2.3239–−2.3223 MJ mol−1
Pharmacology
ATC code	C01EB06 (WHO)
	Pharmacokinetics:
Biological half-life	3 hours
Hazards
	GHS labelling:
Pictograms
Signal word	Warning
Hazard statements	H315, H319, H335
Precautionary statements	P261, P305+P351+P338
NFPA 704 (fire diamond)	1 1 0
Flash point	118.1 °C (244.6 °F; 391.2 K)
Autoignition; temperature	> 400 °C
	Lethal dose or concentration (LD, LC):
LD50 (median dose)	> 2000 mg/kg (dermal, rat)
Safety data sheet (SDS)	ChemicalBook
Related compounds
Related alkanoic acids	Sarcosine; Dimethylglycine; Glycocyamine; N-Methyl-D-aspartic acid; beta-Methylamino-L-alanine; Guanidinopropionic acid;
Related compounds	Dimethylacetamide
	Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa). verify (what is ?) Infobox references

Creatine (/ˈkriːətiːn/ or /ˈkriːətɪn/) is an organic compound with the nominal formula (H₂N)(HN)CN(CH₃)CH₂CO₂H. It exists in various tautomers in solutions (among which are neutral form and various zwitterionic forms). Creatine is found in vertebrates, where it facilitates recycling of adenosine triphosphate (ATP), primarily in muscle and brain tissue. Recycling is achieved by converting adenosine diphosphate (ADP) back to ATP via donation of phosphate groups. Creatine also acts as a buffer.