Compounds in anti-aging supplements include nicotinamide riboside and pterostilbene. The compounds either are converted into cofactors or coenzymes or directly alter cell metabolism and protein activity. In the center is an image of several dietary supplements with these compounds. From left is the structure of the protein SIRT1 bound to NAD+, the chemical structures of nicotinamide riboside, resveratrol, NAD+, and pterostilbene. The microscopy image of the cell shows mitochondria in red (Credit: NICHD/U. Manor, Creative Commons by 4.0). Read more at
N. R. Gough, The Biology Behind Anti-Aging Supplements. BioSerendipity (16 July 2018) https://www.bioserendipity.com/the-biology-behind-anti-aging-supplements/