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A drug can not generally have an oral bioavailability value higher than its value for f H , and oral bioavailability can equal f H only when all of the drug escapes from the GI tract and is able to enter the portal circulation (i.e
Orlandi A, et al
Molecular neurobiology
The reduced precursors NRH and NMNH show promise in overcoming this, although preclinical evidence for health benefits is still limited, and whether their efficacy on functional readouts would be superior to the classic counterparts NR and NMN is also unclear
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