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Almost every natural food source of vitamin B12 is animal-based, according to the NIH Office of Dietary Supplements (ODS)
Acute symptoms such as fatigue may improve relatively quickly, whereas neurological symptoms like paraesthesia (pins and needles) or cognitive difficulties typically require longer treatment courses
"Cyanocobalamin Drug Usage Statistics, United States, 2014 - 2023"
Once injected, B12 enters the bloodstream directly without requiring stomach acid, intrinsic factor (a protein necessary for B12 absorption), or healthy intestinal function
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