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Why Diagnosis Matters Before Treatment Taking B12 without understanding the cause can sometimes delay proper diagnosis

If you have malabsorption syndrome (such as short bowel syndrome, certain bariatric surgery patients, chronic pancreatitis, or celiac disease that severely impairs nutrient uptake), you might need these injections indefinitely to prevent recurrent deficiencies

Nature 558 , 470474 (2018)

The published research on oral B12 bioavailability consistently shows around 1% absorption meaning of a 1000mcg oral dose, only about 10mcg actually reaches your cells

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Urinary or plasma methylmalonic acid (MMA), a substance produced in the body thats dependent on B12, is also helpful for detecting early stages of B12 deficiency