How to self administer subcutaneous B12 injection., 1. Withdraw proper dosage from vial into an insulin syringe, 2. Clean site of injection (abdomen or other proper site), 3. Pinch the skin where you B12 SELF INJECTION GUIDE IM SELF INJECTION HOW DO I SELF INJECT? HOW TO SELF INJECT B12 Dr Ayanna Knight Cosmetic Skin Care, Health & Wellbeing Botox Brighton HOW TO SELF INJECT B12 AT HOME with Dr. Tyler Rogers , , If youve been prescribed vitamin B12 shots or exploring at home wellness, this step by step guide will walk you through how to do your own How to self inject intramuscular vitamin B12 Overview Guy's and St Thomas' NHS Foundation Trust