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Possible complications heart failure severe neurological deficits gastric cancer type 1 diabetes rheumatoid arthritis myasthenia gravis (a chronic condition causing muscle weakness) Hashimotos disease (an autoimmune condition affecting the thyroid) A pregnant or nursing person with a B12 deficiency When a person receives treatment for a B12 deficiency, they generally recover well and cease to have symptoms, although they may need to continue to use B12 nutritional supplements
Most people do not need high doses of B vitamins to maintain their health
Current Pharmaceutical Design , 24(18), 19902001
Nothing here is exotic sterile technique and accurate microgram measurement matter far more than any single tool
Getting checked and approved by an independent lab is completely voluntary for supplement manufacturers
Neither is acceptable
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