B12 Injections at Home Safety Guide for Self Administration Infusion For Health 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 Vitamin B12 Injections What You Need to Know, Vitamin B12 is essential for energy production, brain function, and nervous system health. A deficiency can lead to symptoms such as fatigue, mood How to give yourself a B12 shot How to Give a B12 Injection: Step By Step Instructions