Vitamin B12 Injection: Energy Boost and Anemia Treatment Mountainside Medical Exactly HOW I use retinoids on my neck and chest , The neck and chest are notoriously less tolerant to active ingredients like retinoids but they can still benefit., so heres how I use it, Dr. prescribed B12 injections. Pharmacy only gave me vials. Where do you get your needles and syringes? What size?? Where do I inject? : r B12_Deficiency Hello, my cat got recommended 0.5 ml of B12 every week. He got 5 shots already. At the moment he's eating less and less. Is the amount ok in your experience? I