[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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Commonly, individuals with malabsorption or anemia might actually receive a combination therapy: a B-Complex injection and a B injection
Most individuals obtain sufficient B12 from a balanced diet containing meat, fish, dairy products, and fortified foods