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Description When youre deficient in vitamin , you may feel tired, depressed, or overall drained
In addition to this, many people have problems metabolizing B12 in low-quality forms like cyanocobalamin due to defects in the MTHFR gene (1) (as many as 40% of people have THIS problem!)
"Dietary supplements and weight control in a middle-age population"
They do not establish a universal response across species, cell systems, experimental concentrations, or material preparations
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