B 12 Kit INTRAMUSCULAR (Cyanocobalamin B12 Injection) Sola Pharma Skin Pals By Health Pals Vitamin B 12 Cyanocobalamin 1,000 mcg mL Intramuscular or Subcutaneous Injection Multiple Dose Vial 30 mL Cyanocobalamin Injection, 2mg mL Olympia Pharmaceuticals 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. Cyanocobalamin (Vit B12) Injection for Pets VetRxDirect