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B12 Injections for Energy and Mood Its true vitamin B12 plays a major role in energy metabolism
Blood tests measuring serum B12 and, if appropriate, methylmalonic acid or homocysteine levels can clarify your B12 status
What gives
Although adverse side effects are rare, some people do experience upset stomach, mild diarrhea, or nausea
Hair loss is a multifactorial condition, and B12 deficiency is rarely, if ever, the sole cause
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