How to Give a B12 Injection: Step By Step Instructions How to Give a B12 Injection: Step By Step Instructions 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 B12 Injection IV or IM Sandoz Vitamin B12 Injectable Solution 1000 mcg 10 mL Vitamin B12 Vitamin B 12 Injection Mobile and Clinic IV Therapy ASAP IVs IV Hydration Experts of San Diego, Phoenix, Scottsdale, San Francisco