What Causes B12 Side Effects? Are B12 Shots Safe? Royal Palm Beach Medical Group Compounded Methylcobalamin (Vitamin B12) Injection, 5mg mL 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 Signs and Symptoms of Vitamin B12 Deficiency
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can b12 injections cause headaches Vitamin B12 Injection Side Effects and Safety