Is a 1 mg intramuscular vitamin B12 injection safe for a pregnant woman with confirmed B12 deficiency and no known cobalamin allergy or severe renal hepatic impairment? 10 benefits of taking vitamin b12 injections 1. Improves metabolism and supports weight loss 2. Helps against anxiety and depression 3. Increases red blood cells 4. Healthier hair, skin, and 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 Vitamin B12 injections deliver high doses of this essential vitamin directly into your bloodstream for better absorption than oral supplements to boost energy, support red blood cell production and maintain nerve function. On The Go B12 Injection at enTrust Urgent Care Center Clinic