B12 Shots at Home: How, Where & How Often to Inject Yourself AZ IV Medics Vitamin B12 deficiency can cause symptoms like headaches, fatigue, depressive mood, gastrointestinal issues, and more. While vegetarians are at a higher risk of vitamin B12 deficiency, it can affect non vegetarians too. Check B12 Injections for Energy: Benefits and How It Works AZ IV Medics Vitamin B12 Injections Energy Boost The Center Medical