Maxi-B 1000 100mL is Durvet's highest level of vitamin B12 available. For use as a supplemental source of B Complex vitamins in cattle, swine, and sheep. Contains 1000mcg of B12, 1.25mg of B1, 5mg of B6, and 2mg of B2. Dosage: Subcutaneous or Intramuscular injection is recommended. May be administered intravenously at the discretion of a veterinarian. The following suggested dosages, depending on the condition of the animal and the desired response.