Your body needs vitamin B12 to keep blood cells healthy and to make your nerves work right. But what happens when you run low? Here are some signs: https: wb.md 3OUOc1J B12 Injections for Energy: Benefits and How It Works AZ IV Medics 5 Triggers of Neuropathy and How to Get Relief Dr. Atallah DO The Link Between Vitamin Deficiencies and Neuropathy: Houston Neurological Institute: Neurology Specialists Why Do I Feel Worse After My B12 Injection: 6 Body Reactions