Vitamin B12 Injections: Vital Therapy for Pernicious Anemia Why Do I Feel Worse After My B12 Injection? Understanding Post Injecti Oxford Origins Why Do I Feel Worse After My B12 Injection? Understanding Post Injecti Oxford Origins Benefits of B12 Injections for Optimal Health 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