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 Shots: Vitamin B12 Injections Benefits, Uses, Risks Dr. Axe B12 Injections for Energy: Benefits and How It Works AZ IV Medics Ear Nose and Throat An ENT's Guide to Understanding Headache Issues After Botox Why Do I Feel Worse After My B12 Injection? Understanding Post Injecti Oxford Origins Signs and Symptoms of Vitamin B12 Deficiency