From:
https://www.truniagen.com/blog/science-101/what-is-nad/
"NAD+ is not a great standalone supplement.
Direct supplementation of the molecule NAD+ is only modestly effective due to its inability to enter cells directly.
A paper in the Journal of Nutritional Science and Vitaminology shows that your body breaks orally administered NAD+ down to smaller molecules in order to be used.
Once in the cell, they will need to be reassembled again. This breakdown and reassembly require extra energy and time, making direct supplementation of NAD+ an inefficient way to boost your body’s NAD+ levels."
Trump at rally just now “I will prevent World War 3.”