Benefits of B12 Injections for Optimal Health Vitamin B12 shots Prescription injections used to treat severe deficiency, pernicious anemia, or absorption issues (e.g., Crohn's, gastric bypass). They provide rapid, 100% absorption directly into the bloodstream, bypassing the digestive system. Vitamin B12 Injection Training Boost Your Clinical Skills , Learn safe and professional Vitamin B12 injection administration techniques with hands on practical training. Gain confidence in How to self inject intramuscular vitamin B12 Overview Guy's and St Thomas' NHS Foundation Trust