Why Do I Feel Worse After My B12 Injection? Understanding Post Injecti Oxford Origins B12 Shots Do You Need a Prescription? A Complete Guide Carter's Walk In + Urgent Care B12 Injection: Uses, How to Take It & Side Effects Tua Sade Vitamin B12 Benefits and Best Sources 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