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If low B12 damages this sheath, nerve signals can misfire, leading to symptoms like tingling, numbness, or that awful pins and needles feeling
People taking high-dose B12 supplements (1,000 to 5,000 mcg daily), receiving B12 injections (cyanocobalamin or methylcobalamin), or consuming heavily fortified foods can easily push their serum levels above 900 pg/mL
(Pfizer)
When you purchase supplements, always make sure that youre buying them from reputable manufacturers and that the products have been tested by third parties, like the U.S
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