Common symptoms of a vitamin B12 deficiency include: Tiredness Lethargy Feeling faint Breathlessness Less common symptoms include: Headaches Heart palpitations Altered taste Loss of appetite Ringing in the ears (tinnitus) Looking pale Sore mouth and tongue If it is left untreated you can end up with longer term problems including: Psychological problems such as depression, confusion, memory problems Nerve problems such as numbness, pins and needles, vision changes and unsteadiness A blood test can indicate if you have a B12 deficiency
Weight loss phase: You eat a very low-calorie diet, usually 500 to 800 calories per day
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When you swallow a B12 pill, several steps have to work for it to be absorbed: stomach acid and the enzyme pepsin must release B12 from food or the supplement, the stomach must secrete a protein called intrinsic factor that binds to B12, and the B12-intrinsic factor complex must reach the ileum (the end of the small intestine) where it is finally absorbed
They come in tablets, capsules, and sublingual forms