The short answer is that I am uninterested in a perpetual diet of NR for health reasons.
The long answer... well, here we go...
History?
For a history of my reported experiences on NR, please follow back through the quoted post (it should have quoted posts that continue to take you back fully on my reports).
Heart Palpitations Eliminated
I wanted to give a quick update on my situation. On 4/9, I began again to take NR at a reduced dosage of 150 mg/day on T/Th/Sat only. (I open the capsule and take it via sublingual.) Since then, the heart palpitations I was experiencing have stopped completely. This is actually amazing to me. It was really odd that I began to experience heart palpitations, frequently, when I dropped from 300 mg/day on T/Th/Sat/Sun to no dose.
Inconclusive on Deep Sleep Enhancement
The deep sleep loss I reported has remained relatively unchanged. It did tick up the first week back on NR to an average of 2h 1m per week, and then it reverted back to about an average of 1h 30m per week. Consequently, I am wondering if pterostilbene is actually the vehicle responsible for enhanced deep sleep. I want to give it another month before I begin to experiment with pterostilbene again.
Mild to Medium Evidence of Exercise Performance Losses and Joint Pain
Regarding joint pain, I did experience some increased joint pain that seemed irregular on the 2nd day of taking NR. This was while performing push-ups. Since then, I have not really had any further joint pain. This leads me to believe that possibly 150 mg/day is too low of a dose to cause joint pain or that pterostilbene was mostly responsible (or completely responsible). My joint issues (wrist, finger, and hip) have continued to heal. I have significantly more mobility than I did when I began posting about my experience. I do seem to think that I have worse exercise performance on days that I take NR, but I'm willing to ignore this for the most part, for now. Everything seems harder and more tiring on days that I exercise and take NR. This will probably eventually lead me to only taking NR on non-exercise days (2 days a week), but I want to give it some more time to assess.
Brain Fog Eliminated
Lastly, the reported brain fog that seemed to crop up when I eliminated NR is now gone. I definitely think NR is helping me think more clearly, and I believed that before I stopped taking it.
Personal conclusion: For now, I will continue taking NR at 150 mg/day on T/Th/Sat only, unless new research comes to light that suggests I should stop. I do not plan to up my dose to 300 mg/day, mostly due to the exercise performance issues I am seeing. In a month, I may begin experimenting with pterostilbene again to see if it is responsible for the deep sleep gains I reported while on NR/pterostilbene.