Vitamin B12 Injection Dosage for Adults: 7 Key Medical Guidelines Liv Hospital Why Do I Feel Worse After My B12 Injection? Causes & Management Bolt Pharmacy Vitamin B12 Monthly Injection Dose: Typical Dosages & Administration Methods Liv Hospital How Often Should You Get Vitamin B12 Injections? Vitamin B12 (cobalamin) and folate (vitamin B9) are vitamins that serve important functions in the human body. Folate is needed for development and growth of cells (including red blood cells) and synthesis What Happens If You Inject B12 Wrong: 6 Red Flags