Inject 1cc/1ml (100 units) twice a week by Intramuscular injection.
Inject B12 Intramuscular (IM), they are given directly into the central area of the deltoids (shoulder). Â A needle is inserted with a quick thrust at a 90-degree angle. The needle penetrates the skin and subcutaneous tissue, and the medicine is deposited in the underlying muscle. The deltoid muscle in the upper arm is the preferred injection site for IM administration.