The Benefits of B12 Injections 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 Best for: Metabolism support, weight management efforts, sluggish energy AKA Lipo Mino MIC with L carnitine, this lipotropic injection contains amino acids, vitamins, and a mineral blend to increase metabolism, break down carbohydrates, and Vitamin B 12 Injection Mobile and Clinic IV Therapy ASAP IVs IV Hydration Experts of San Diego, Phoenix, Scottsdale, San Francisco