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, What Are B12 Injections? And Are They Safe? OmegaQuant B12 Injection sites + How to use B12 Shots Safely Vitamin B12 Injections London Holborn Travel Clinic NEW TREATMENT ALERT A vitamin B12 injection helps treat or prevent deficiency by delivering the vitamin directly into the bloodstream. It's often used for people with absorption issues and is usually safe