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Description
NAD is a naturally occurring coenzyme present in many biological systems and referenced extensively in scientific and biochemical research
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Injections typically contain methylcobalamin or cyanocobalamin , two forms of B12

Use-by dates for B12 I posted recently about a three month decline and symptom return as my B12 batch approached its...

Another is in vivo confocal microscopy of fluorescent dextran (MW ~ 10 kDa) that when injected intravenously penetrated the intercellular junctions up the region of the tight junctions
