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At the same time, B12 insufficiency in the liver leads to shrinking of the intestinal cells and malabsorption of nutrients (including B12 itself), leading to a cycle of worsening B12 deficiency
Interrupting the process to hunt for supplies increases the chance of contamination
The timeline varies by injury severity, with acute injuries responding faster than chronic conditions that have been present for months or years
It should be given in a clean, clinical setting to reduce the small risk of infection or irritation at the injection site
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