Mecobalamin (METHYCOBAL®) is a clear, red liquid containing the following ingredients.
| Ingredients | Content per ampoule (1 mL) | |
| Active ingredient | Mecobalamin (JAN/INN) | 500 mcg |
| Inactive ingredient | D-Mannitol | 50 mg |
| Product description | Methycobal is a clear, red liquid contained in brown ampoule (one-point-cut type) | |
| pH | 5.3-7.3 | |
| Osmotic pressure ratio | about 1 (ration relative to isotonic sodium chloride solution) | |