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Efficacy and safety of fortification and supplementation with vitamin B12: biochemical and physiological effects

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Below are symptoms commonly attributed to b12 deficiency: Anemia Fatigue Weakness Constipation Loss of Appetite Weight loss Numbness or Tingling Depression Confusion Memory Impairment Burning Tongue/Mouth Dosages A 2015 paper published by the EFSA Panel on Dietetic Products considered 8 separate studies on Vitamin B12 ranging in dosages of 1.5-3.0 mcg/day