B12 Shots at Home: How, Where & How Often to Inject Yourself AZ IV Medics Vitamin B12 deficiency is a common health problem that can have serious consequences but doctors often overlook it Still feeling tired even after good sleep? It might be more than just stress it could be Vitamin B12 deficiency., In Part 2, Dr. Pydi Satish, Consultant General Physician, explains the signs, causes, B12 Injection Frequency: How Often Should You Get a B12 Shot? Liv Hospital B12 vs. Immune Boost Injections: Which One Is Right for You? Head & Heart Health and Wellness B 12 Intramuscular vs. Subcutaneous Injection