A lot of research done on the various forms of NAD precursors and how they make you feel younger is out there. TruNiagen in particular sell various forms of Nicotinamide Riboside. The capsule and IV forms are popular. There are other forms, but do we really need them?
Actually, there may be enough precursors in our diet. However, due to suboptimal aging, the recycling pathway doesn't work as well. It's like the Waste Management company arbitrarily swapped your standard issue recycling cans for a something the size of a lunchbox.
How do we get them back? The plan will include nutritional and occupational strategies with circadian timing.