Vitamin B12 Deficiency: Causes, Symptoms, and Treatment B12 Injections Explained Vitamin B12 plays a key role in energy, metabolism, and nerve function. Injections allow direct absorptionespecially helpful for those with low levels or absorption issues. DM to book Pernicious Anemia: Definition, Symptoms, Causes & Treatment B12 Vitamin Injections Goddess Aesthetics Vitamin B 12 intramuscular injections are also used therapeutically to help restore energy and combat various symptoms related to such deficiencies. Vitamin B 12 is essential to the development of healthy blood cells, nerve