B12 Injections for Energy: Benefits and How It Works AZ IV Medics Methylcobalamin Injection (Vitamin B12) Empower Pharmacy A vitamin B12 deficiency can cause a range of symptoms, including some that appear in the mouth Experiencing any of these symptoms? B12 supplementation might be right for you. Some causes of low B12 are diet, alcohol use, certain diseases like Chrohn's and Celiac Disease, and Gastric Bypass surgery, How Quickly Does a B12 Injection Work? Timeline and Expectations Bolt Pharmacy