Problems due to lack of cell division in fast dividing tissues: Anaemia, or any cytopaenia (including leucocytes, lymphocytes, platelets) Mouth ulcers, malabsorption, diarrhoea due to macrocytosis and atrophy of the intestinal mucosa as demonstrated by Foroozan and Trier
For non-hormonal subcutaneous or intramuscular chemotherapy, use CPT 96401
So, if you're feeling unwell due to a deficiency, restoring B12 levels might help you feel well enough to eat normally, but it's not "making" you gain weight in an unhealthy way
Common B12 deficiency symptoms include fatigue, anxiety, depression, poor memory, confusion, brain fog, tingling or numbness in the extremities, zings or zapping feelings in the extremities, anemia, shortness of breath, muscle weakness, irritability, tender calves, pale complexion and more