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Peer review Peer review information Nature Communications thanks the anonymous reviewer(s) for their contribution to the peer review of this work
If left untreated, it can lead to Heart palpitations and shortness of breath Weakness, tiredness, or lightheadedness Pale skin Vision loss Constipation, diarrhea, loss of appetite, or gas A smooth tongue Depression Memory loss Behavioral changes Numbness or tingling Muscle weakness Problems walking not trying to give you the wobbles here!), low levels of B12 can be linked to the development of pernicious anemia, dementia, or osteoporosis
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Cancer Risk: Some growth factors can promote tumor development
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