Standard Guideline Template How Long Do B12 Injections Last: 5 Ways to Extend Effects The B12 Shot: What Every Human Needs to Know About Injectable Vitamin B12 Cyanocobalamin (B12) Products American Regent B12 Shots vs. IV Infusions: What is the difference? Integrative Medicine, Laser and Aesthetics TYPES OF INJECTIONS, Injections are parenteral routes of drug administration used when rapid action is required, oral route is not feasible, or precise dosing is needed., 1. Intradermal (ID)