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In addition, B12 deficiency-associated fatigue is often accompanied by other symptoms such as numbness and tingling, cognitive impairment (memory and concentration problems), mood swings (depression), skin changes (pale skin), shortness of breath, or fast heart rate
Up to 350 mg per day from supplements appears safe, though exceeding this may cause diarrhea
[PMID: 30778219] PubMed record related to this compound for laboratory literature review
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