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It's NMN (NICOTINAMIDE MONONUCLEOTIDE) and sold through everyone including Wal-Mart and Amazon. Whether it works... on humans? I don't know and I'm not aware of any (completed) human studies.

From the article:

"The new study, in Cell, found that boosting mice’s levels of the naturally occurring molecule NMN, which humans also have, increased levels of another called NAD+."

NMN is nicotinamide mononucleotide, available on Amazon.

There was a thread a year or so ago on HN where some people mentioned that they narrowed down their supplements to NMN and something else and were happy about that.

I believe it was NMN and Resveratrol (or Pterostilbene.).

The amazon reviews are pretty positive fwiw .. probably not much.