The Truth About B12 Injections: Benefits, Cost & How They Work B12 injections UK How I give myself a vitamin injection Hi Dr. Tony here! If you give yourself injectionstestosterone, estrogen, insulin, peptides, or B12these are 3 of my favorite tips to make them almost painless. Tip 1: Insert the needle quickly, then Not all shots are the same here's a guide Injections are a fast, effective way to deliver medications, nutrients, and vaccines directly into the bodybut not all injections are the