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Description
Normal serum vitamin B12 levels range between 200-900 pg/mL, with concentrations less than 200 pg/mL usually resulting in deficiency

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Leuk Res (2006) 30(11):13918.10.1016/j.leukres.2006.03.024 122 IngleyE
Cellular NAD+ pools are depleted because nicotinamide gets shunted into methylation rather than NAD+ salvage pathways

Though they were just a bit slower, no more than 90 minutes passed from the time we sent our email inquiry to the moment we received a response