B12 Shots Dosage for Adults: How Much, How Often, and Key Injection Guidelines Liv Hospital Oral vs. Intramuscular Vitamin B12 in Vitamin B12 Deficiency The Blood Project How Vitamin B12 Injection Dosage and Frequency Influence Weight Loss AlabamaAgeline.gov Cyanocobalamin is the preferred supplemental form of vitamin B 12 as there is insufficient evidence to support the efficacy of the other forms like methylcobalamin. Michael Greger MD, How Not to Die. A Guide to Vitamin B Complex Injection Benefits and Dosage Cyanocobalamin (B12) Injection 1000 mcg mL, Multiple Dose Vial 30 mL McGuff