How to Give a B12 Injection: Step By Step Instructions The Benefits Of Vitamin B12 Ugly London. Acupuncture & Chinese Herbal Medicine a disposable syringe with a needle and an ampoule with red (vitamin B12) liquid in male hands in blue (lilac) nitrile gloves. On a white background Stock Photo Alamy 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