Is it normal to feel tired after b12 injection? B12 Shots Dosage for Adults: How Much, How Often, and Key Injection Guidelines Liv Hospital Why Do I Feel Worse After My B12 Injection? Causes & Management Bolt Pharmacy Side Effects of B12 Injection (Common and Serious) Credihealth B12 Injections Maryland Plastic Surgery Now offering B12 injections! If these symptoms sound all too familiar, it might be time to check your vitamin levels. B12 injections may be absorbed up to 90% more effectively than oral