Nicotinamide riboside is uniquely and orally bioavailable in mice and humans.

Nat Commun · 2016 · PMC5062546 · PMID 27721479

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quite significantno p-value reported

In mouse liver, the apparent flux through this pathway is quite significant: the NR-driven peak of NAAD amounted to 10% of the NR-attributable peak of NAD + .

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Quoted from the open-access full text in Europe PMC under the licence the publisher applied. The sentence is reproduced exactly as published; the emphasis is ours.