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Signs and symptoms: Many common symptoms can be caused by vitamin B12 deficiency, including weakness, tiredness, lightheadedness, heart palpitations, shortness of breath, pallor (pale skin), diarrhea, decreased appetite, nerve problems like numbness or tingling, visual changes and psycho-emotional problems like depression, memory loss or behavioral changes

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In our experience from member comments, no primary care doctor in the UK has access to, or has heard of, this test

Low levels of vitamin B12 may be caused by: Pernicious anemia, a condition where a person's immune system mistakenly reduces their ability to absorb the vitamin