There seems to be at least 3 Nestle products with the Celltrient name: Protect, Energy and Strength. One is a NAD product, one(this) is a glycine/NAC product(not available on Amazon because of NAC) and one is a Urolithin A product. The studies I see(and have been posted here in the last few days) seem to suggest all three are important. In other words, it would be a 3 pill regime whether using Nestle or a health/vitamin shop.
https://www.nestlehealthscience.com/newsroom/press-releases/celltrient
Honestly, Nestle has identified three separately useful supplements for addressing older age issues.
We also take nicotinamide riboside (not from Nestle), but not the urolithin A, at this time, but studies show urolithin A is helpful in a similar way to NAC.