science

That’s not how science works.

Complain about that in the news or medicine channels, and probably not the medicine channel, either. This is a science channel, where science is discussed.

You missed this part:

The pharmacological approach in this study, however, uses a pharmacologic agent (P7C3-A20) that enables cells to maintain their proper balance of NAD+ under conditions of otherwise overwhelming stress, without elevating NAD+ to supraphysiologic levels.