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In mild cases, low levels of vitamin B12 can cause fatigue and anemia, while more serious deficiencies can lead to serious neurological and heart impairments

[DOI] [PubMed] [Google Scholar] 132.Olzmann JA, Richter CM, Kopito RR

Aids Weight Management and Increases Metabolic Rate While not a miracle weight loss solution, B12 does play a role in supporting metabolism

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In fact, people with vitamin B12 levels on the lower side of normal performed worse on memory tests than those with high-normal levels in a study in The American Journal of Clinical Nutrition (5)