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 Vitamin B12 absorption pathways and main factors and organs involved: Download Scientific Diagram Injection is a technique for delivering drugs by parenteral administration, that is, administration via a route other than through the digestive tract. Parenteral injection includes subcutaneous, intramuscular, intravenous, intraperitoneal What is B12 Injection Used for? ThinWorks How Long Does Vitamin B12 Take to Work? Timeline & Signs Performance Lab