Here is an example of a scientist discussing the NAD issue
https://www.scienceofnad.com/post/does-nr-cause-cancer
If you have cancer..or at high risk genetically for triple negative cancer as I am as per my genetics test...then you have to rethink NAD +. I wouldn’t be taking it at all if I didn’t have a different genetic issue that may mean I am low on it. I can’t find a test that I can get a Dr to order to check my levels other than a B3 test which is not the same.
Pay attention to what that Dr says at the end. It’s basically a crapshoot. Science just doesn’t know right now. It’s going to depend on your body and your genetics as to whether NAD+ is going to help you in the long run.... Harm you..or do nothing to you.