Understanding Vitamin B12 Injections for Peripheral Neuropathy You might need a B12 injection if you're constantly feeling tired, run down, or low on energy. B12 supports energy levels, metabolism, mood, and neurological health. to help your body feel its B12 injections are amazing and can help with so many different issues we may have including Preventing Anaemia Alleviates Anxiety Improves Sleep Boosts Energy Improves Brain Power Supports Heart 8 Reasons to Get a B12 Shot at Texas Heart & Vein Today: Texas Heart and Vein Multispecialty Group: Cardiovascular Doctors Vitamin B12 is required for the function and development of many parts of the body, including the brain, nerves, and blood cells Since your body doesn't make vitamin B12, you have to