No. I heard
Dr. Paul Jones talk about the difficulty measuring. Unstable in blood and blood does not represent qty in organs and tissues. Similar probs measuring Glutathione.
The science says NAD is definitely doing it's job. Whether the cellular environment is ready to use it is why we geek out on the MOTS/SS31 Mito health path. I'm convinced it's working behind the scenes for me, catch a flush at 100mg, but am not banking on the energy rise. That said, you bet I wanna blast 500mg to see what it's like. Common IV dose is 750ml. The other research rat and I both get some gastro going on pin day.
I'm messing with 100mg 3x weekly. Clinics (Konniver and Jones) use a "loading dose" --100mg for week then come back for the IV big bag. Patients then return 1x monthly or once weekly depending.