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Your Overall Health Underlying health conditions, such as gastrointestinal disorders (like Crohns disease, celiac disease, or atrophic gastritis) that impair nutrient absorption, or certain medications you may be taking, can influence how your body absorbs and utilizes B12

A 2019 study found that B12 supplementation during chemotherapy was associated with poorer outcomes

Symptoms of a B12 Deficiency Initially, the symptoms of B12 deficiency can be difficult to notice

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Scientists observed that as organisms age or gain excess weight, their fat cells (adipocytes) produce excessive amounts of NNMT

We have some idea of possible risk factors, though