Vitamin Injection Stay In Your System Longer Than Tablets Do. Work Istantly And Give The Best Benefits. When taking tablets only 15% stays in your system. The rest is secreted out of Compounded Hydroxocobalamin (Vitamin B12) Injection Compounded Methylcobalamin (Vitamin B12) Injection, 5mg mL Fun Fact Friday! Ever wondered Why is my B12 injection red? All B12s are cobalamins they have a cobalt atom at the center of a special ring shaped molecule called Have you ever received a vitamin B12 injection? If so, how did you feel? Vitamin B12 injections have many benefits, some including: Improving energy levels Enhancing mood Improving cognition Supporting heart function Give Your Batteries a Charge with Vitamin D Injections Advanced Cryo NYC