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Nevertheless, faeces in general tend to be a rich source of B12 that we certainly do not recommend but its a source of B12 for many animals and may explain why in predominantly vegetarian populations in areas lacking sanitation, poor people tend to have a better B12 status than the urban middle class (Sobczyska-Malefora et al., 2021)

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Interestingly, vitamin B12 deficiency itself can sometimes affect neurological function, potentially including the nerves that control bowel function, so treating a deficiency may actually improve rather than cause bowel symptoms in some cases

This is not inherently dangerous