B12 Injections for Energy: Benefits and How It Works AZ IV Medics How to Give B12 Injections at Home to Yourself PA Relief Types of injections explained! Understanding the angles: intramuscular (im) : injects deep into the muscle at 90. subcutaneous (sc) : goes under the skin at 45. intravenous (iv) : Vitamin B 12 Injection Mobile and Clinic IV Therapy ASAP IVs IV Hydration Experts of San Diego, Phoenix, Scottsdale, San Francisco