Vitamin B12 Injection and Medications Uses, Benefits & More iMuscles Nutrition Top 5 Vitamin Injections & Their Uses, These injections help treat vitamin deficiencies and support overall health., 1 Vitamin B12 Injection Helps in nerve weakness & deficiency, 2 Vitamin D3 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 What is B12 Injection Used for? ThinWorks