What could cause HRV to drop after NAD+ supplements?

[EthanL]

I’ve been tracking my HRV for about six months now, and I’ve noticed it consistently drops the day after I take my NAD+ precursor, even though I feel fine. Has anyone else experienced this kind of paradoxical response to a supplement that’s supposed to support recovery?

[EllaL]

I had something similar. I started a NAD+ precursor hoping to boost recovery, and HRV would dip the day after. I felt fine, slept okay, but the number would tank the morning after a dose. I kept logging sleep, caffeine, workouts, and stress; there was no single smoking gun. After a couple of months I paused the supplement and the pattern faded a bit, but not in a clean way.

[Timothy_H]

HRV does this kind of zigzag even without supplements. Maybe a blip, maybe a longer cycle. I wouldn’t overfit the trend to the pill unless it repeats after stopping.

[PenelopeSM]

Are you sure you’re measuring at the same time every day with the same device?

[RyanL]

I once chased a similar thing for a while and then tried not to read the numbers so tightly. The data didn’t settle into a neat story, and I kept a log anyway, hoping something would clarify it, and sometimes it did, other times not. It felt more like the body saying not everything can be optimized at once.