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The Journal of laboratory and clinical medicine, 133(6), 575582

Symptoms of vitamin B-12 deficiency include: Fatigue Difficulty concentrating Decreased mood Loss of appetite Poor memory Constipation Higher-risk groups for vitamin B-12 deficiency include people with intestinal disorders such as Crohns or Celiac disease, as well as those who suffer from muscular degeneration, Lou Gehrigs disease or diabetes

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Removing dissolved solids (TDS) may be desirable if your tap water is known to contain large amounts of dissolved solids that negatively affect taste, but you may also be removing essential minerals