Book in for your Vitamin B12 injections privately. Booster dose is 6 injections over 2 weeks for 150, then one injection every 8 12 weeks for 30 depending on your symptoms returning!!! Very B12 for cats Feline Infectious Peritonitis Vitamin Injection (IM Shot) Dr. Revive IV Therapy & Pain Clinic. 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)., Vitamin B12 Monthly Injection Dose: Typical Dosages & Administration Methods Liv Hospital