My wife and I were debating the use of supplements yesterday.  We got on to NAD+ and 🤔:

People with high X (cell health) have high Y (NAD+).

If we measure Y to determine X, does supplementing Y raise X (cell health) or does it just increase Y (the thing we measure -> NAD+). 

Does anyone know? 

cc: @bryanjohnson

I got some solid anecdotal responses on this, but casting a wider net if there are people on here spending their days on longevity research. 🚀

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