Choline is a water-soluble nutrient.[1][2][3][4][5] It is usually grouped within the B-complex vitamins. Choline generally refers to the various quaternary ammonium salts containing the N,N,N-trimethylethanolammonium cation. (X− on the right denotes an undefined counteranion.)

Starting at
| IUPAC name 2-Hydroxy-N,N,N-trimethylethanamonium |
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| Other names Bilineurine, (2-Hydroxyethyl)trimethylammonium |
| CAS Number | 62–49–7 |
| Beilstein Reference | 1736748 |
| ChEBI | CHEBI:15354 |
| ChEMBL | ChEMBL920 |
| ChemSpider | 299 |
| DrugBank | DB00122 |
| EC Number | 200–655–4 |
| Gmelin Reference | 324597 |
| IUPHAR/BPS | 4551 |
| Jmol interactive 3D | Image |
| KEGG | C00114 |
| PubChem | 6209 |
| UNII | N91BDP6H0X |
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InChI[show] |
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SMILES[show] |
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| Chemical formula | C5H14NO+ |
| Molar mass | 104.17080 |
| Density | 1.09 g/ml |
| Boiling point | 305 °C (581 °F; 578 K) |
| Solubility in water | 500 mg/ml |