The Truth About B12 Injections: Benefits, Cost & How They Work If you have a low vitamin B12 level, injections can go a long way toward improving your health and well being. But if your B12 level is normal, don't fall for claims that 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 Injections: How They Work and Who Needs Them Meo Nutrition Vitamin B12 Injections Energy Boost The Center Medical Vitamin B12 Injections: Benefits, Who They're For, and What to Expect at Skinox Skinox Aesthetics