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Pale skin Heart palpitations Shortness of breath A smooth tongue Vision loss Constipation Loss of appetite Diarrhea Gas Vision loss Mental problems like depression, memory loss, or behavioral changes Nerve problems like numbness or tingling, muscle weakness, and problems walking

Atrophic gastritis, with resulting hypochlorhydria, is a major cause, especially in the elderly

Regular lab monitoring is critical to managing B12 levels effectively, especially for those with ongoing deficiencies

Regular screening may be done if you have risk factors or symptoms such as fatigue, numbness, or pale skin

do not double up doses

Vitamin B12 deficiency and the nervous system: beyond metabolic decompensationcomparing biological models and gaining new insights molecular and cellular mechanisms