I can do 2g of niacin and not flush. Besides, one should simply take aspirin to avoid the flush if it is an issue for them plus it keeps NA serum levels higher for a longer period of time. Here is a quick and general summary from the other, and quite long thread, on the subject. Keep in mind that as of this post, the timing of supplements still needs to be worked out in regards to circadian rhythm as that has quite a profound effect.
Interestingly, the coadministration of aspirin with nicotinic acid mitigates the annoying episodes of flushing that occur with this drug, and it increased the apparent bioavailability of the drug by yielding greater and prolonged nicotinic acid plasma concentrations for a given dose. - source
Personally, I liked the flush and its unfortunate I no longer do it. I still believe NA is an alternative to NR with the side affect of improving your lipid profile. The question is which is going to be the most effective considering dose/price/safety points. Interestingly enough, NA is actually better at increasing NAD+ levels in some cells as compared to NR.
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On a side note, nicotinamide is not an option as far as I am concerned for health reasons, not to mention, it is less effective than NA at increasing NAD+.
Build up the precursor supply with NA and Aspirin:
NA -> NaMN -> NaAD -> NAD+
or NR:
NR -> NMN -> NAD+
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Open up the NAD+ flood gates by inhibiting CD38 - source
Apigenin, Quercetin, Cyanidin 3-glucoside, Luteolin
PARP 1 Inhibition to Increase NAD+ levels:
Resveratrol
Methyl donors if supplementing NA (maybe with NR too but less so) and/or you are an under-methylator
TMG, SAM-e, Methylcobalamin, Methylfolate
Increase AMPK to increase NAD+
Exercise, Resveratrol, Metformin, Quercetin, ECGC, Curcumin, Garlic