A Guide to Vitamin B Complex Injection Benefits and Dosage Cyanocobalamin Injection USP 1000 mcg mL Comment b12 to get free ebooks. Vitamin B12 Injection Complete Dosage Guide, 1 Forms of B12 Used for Injection:, Methylcobalamin Active, brain + nerve repair form (best for long term use)., Cyanocobalamin 1,000 mcg mL Injection 1 mL McKesson 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