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The cost and availability of auto-antibodies testing, such as intrinsic factor and anti-parietal cell antibodies, can be a barrier to further investigation for vitamin B12 deficiency to exclude pernicious anemia
doi:10.15420/ecr.2018.11.1 Libby P
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
Serious reactions are rare, but they happen when safety protocols slip
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