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Severe B12 deficiency is widely reported and leads to pernicious anemia since your body needs B12 to make red blood cells, and a deficiency limits its capabilities to build them
Because it is water-soluble, your body naturally filters out excess through the kidneys and excretes it in urine
On/off cycling here is driven by caution, not by tolerance data: because there is no long-term human safety record, building in scheduled off periods is the conservative research default
And besides, what happens if you inject B12 wrong
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