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Levels of a molecule called NAD+, central to energy metabolism, fall with age

Evidence on safety and optimal dosing schedules is limited

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Unlike labor productivity, which only looks at output per hour worked, TFP accounts for multiple inputs, including labor (adjusted for composition), capital, and intermediate goods, using cost-share weights to build combined input indexes

doi: 10.1080/15563650.2018.1533727 Gummin DD, Mowry JB, Spyker DA, et al