Vitamin B12 Shots Specialist Near Me in Canton, MI Vitamin B12 Side Effects: How Much is Too Much? ivconcierge.com 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, B12 Shots at Home: How, Where & How Often to Inject Yourself AZ IV Medics Feeling worse after B12 Injection: Answering concerns. La Vie Med Spa