I'm 35 but I consider myself to be in good health. I plan to re-consider NR supplementation when I hit 40, depending what the scientific consensus is at that time.

What are you hoping to achieve with low-dose NR? I think if you're trying to (1) delay aging, then a low-dose protocol might make sense, but if you're (2) looking to address some of your current health concerns, then (if your budget permits) a higher (normal) dose protocol might be worth trying -- at least in the short-term (say 4 to 8 weeks). Otherwise, in the case of (2) if you were to take a low-dose and didn't see any effect, you might write it off as ineffective, but it was ineffective because the dose was too low!