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Tablets, B-complex products and fortified foods Adults need about 2.4 micrograms of vitamin B12 a day, according to the National Institutes of Health Office of Dietary Supplements
High-dose oral supplements (often 10002000 micrograms daily) or intramuscular injections (typically 1mg hydroxocobalamin) used to treat pernicious anaemia or deficiency states can temporarily elevate serum levels
Recommended Use: Vitamin B12 is recommended for those with fatigue, poor concentration, or low red blood cell levels
Again, it depends
The patients knew what they were receiving, and the outcomes were self-reported
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