(Vitamin B12) Injection is a compounded sterile solution of hydroxocobalamin, a form of vitamin B₁₂, typically supplied at a concentration of 2 mg/mL in a 10 mL vial.^[1]

This medication is available through both 503A compounding pharmacies and 503B outsourcing facilities, meaning it can be prepared for individual prescriptions or in bulk for office use.^[2]

Hydroxocobalamin is administered via intramuscular or intravenous injection to treat and prevent vitamin B₁₂ deficiency, particularly in conditions like pernicious anemia where oral B₁₂ absorption is impaired.

By restoring cobalamin levels, these injections help support healthy red blood cell production, neurological function, and DNA synthesis.