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Vitamin B12 Deficiency: Causes, Symptoms, and Treatment 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 Vitamin B12 deficiency symptoms: Migraine headaches could signal lack of B12 Vitamin B12 Injection Side Effects and Safety
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