B12 injections have been high on my list, and I finally took the plunge today! Better absorption is just one of the perks, as it bypasses the stomach. Bloodwork is typically not B12 Shots Dosage for Adults: How Much, How Often, and Key Injection Guidelines Liv Hospital HYDROXOCOBALAMIN INJ, USP, 1000MCG ML, MDV, 30ML NDC 00591288830 NON RETURNABLE Merit Pharmaceutical Cyanocobalamin (B12) Injection 1000 mcg mL, Multiple Dose Vial 30 mL McGuff Cyanocobalamin (Vitamin B12) Injection 1000 mcg mL, Multiple Dose Vial 1 mL, 25 Tray