B12 Injection Needle Size B12 Syringes Is b12 im or sq Types of injections explained Intramuscular (IM) Inserted at 90 to deliver medication deep into the muscle, allowing relatively fast absorption due to rich blood supply. Subcutaneous (SC) Inserted at about 45 Practice Nurse Professional Resources for General Practice Nursing Syringes and Needles Medical Syringes Luer Lock Needle Injection Techniques Every Nurse Should Know! Whether you're prepping for your NCLEX or brushing up on your skills, here's a quick breakdown of the most common injection routes you'll encounter