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[6] [3] [10] A mild deficiency may not cause any discernible symptoms, but moderate deficiency can cause various symptoms, such as feeling tired, lightheadedness, headaches, cold intolerance, pale skin, sore tongue, upset stomach, loss of appetite, hair and skin color changes, numbness or tingling (pins and needles) of the fingers and toes, and tinnitus, and vision, cognitive or psychological problems

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Sign up for our Food & Health newsletter, it's free monthly Symptoms of vitamin B12 deficiency According to the NHS, low B12 levels can cause a range of symptoms, including those that affect your brain and nervous system, such as confusion and memory issues

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