Conditions such as Crohns, coeliac disease or previous gut surgery, and the autoimmune cause behind pernicious anaemia, all affect how well you retain B12
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When the body is not supplied with this essential nutrient, it can present various health problems, such as fatigue, diarrhea, numbness, shortness of breath, and nerve damage
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[47] Low vitamin concentrations in human milk occur in families with low socioeconomic status or low consumption of animal products