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In most food sources, B12 is bound to a protein molecule released by the metabolic activity of hydrochloric acid and other enzymes in the stomach
Within those categories, the clinical picture is clearer than the internet makes it seem
Without enough B12, red blood cells can become large and irregular (megaloblastic anemia), which reduces their ability to carry oxygen efficiently
Over time, this can lead to inflammation, high blood pressure, poor circulation, and diseases like atherosclerosis, autoimmune disorders, infections, and organ failure
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