Persistent Headaches? You Could Have a Vitamin B12 Deficiency Headache After B12 Shot: 3 Effective Strategies to Feel Better Some Types Of Vitamin B12 Supplements Can Cause This Side Effect 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
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