As I previously discussed, there is a better way to go about this:
Increasing NAD+
Benefits of pricey NR and NMN are no better than just niacinamide. They now realize NR and NMN get converted in the liver to niacinamide. To keep the dollars flowing they now offer sublingual versions. Don't fall for the hype.
Optimal mitochondrial function has circadian patterns, pay attention to this in your niacinamide supplementation.
As far as infusion is concerned, I do not consider that a practical approach although there may be short term benefits. However I believe the same benefits can be attained gradually over time with simple oral niacinamide.
If you want the research backing this up it is all out there, have a go at it. I think you'll reach similar conclusions.
