Quote:
Originally Posted by made it up
NAD which I assume to be connected to NADH
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Yes, NAD is the oxidised form of NADH.
NAD and NADH are essential for all human cells - they play a key role in production of ATP, which is the "energy currency" that all cells need.
From a biochemical perspective, I can't think of circumstances in which somebody could be deficient in NAD but not in NADH.