There is no flushing associated with NR if that's what your asking. I discovered NR on this thread a few months ago. Someone had a bad case of covid and used it to completely recover from a severe case.
NAD+ in 3 Basic Slides - Raising NAD+ (with B3 Vitamins)
Nicotinamide Riboside Benefits, Side Effects, Dosage and More - Dr. Axe (draxe.com)
circle back on NAD info