Do You Need a Prescription for B12 Injections? OmegaQuant B12 Shots at Home: How, Where & How Often to Inject Yourself AZ IV Medics Common Mistakes in B12 Injections to Avoid Taking Vitamin B12? Read this first. While B12 is often hailed as a safe energy and brain booster, many real users are reporting unexpected side effects including anxiety, insomnia, Cyanocobalamin (B12) Injection 1000 mcg mL, Multiple Dose Vial 30 mL McGuff