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Conditions such as Crohns disease or Celiac disease can inflame the gut lining, making it difficult for the small intestine to absorb B12 efficiently
Nausea or temporary digestive discomfort
The time it takes for B12 treatment to work depends on several factors, including the severity of deficiency, the route of administration, and individual patient characteristics
Some research suggests low vitamin B12 levels are associated with higher body weight, but more research is needed in this area
Citterio, A
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