What Happens If You Inject B12 Wrong: 6 Red Flags Scientists Just Found a Major Problem With Vitamin B12 Guidelines And Your Brain Might Be at Risk 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 Vitamin B12 plays a crucial role in your nervous system, blood formation, and energy levels When levels are too low, your body sends warning signals you shouldn't ignore. Common symptoms of Neurological Effects of Vitamin B12 Deficiency & More