Brighty, I'm 70, and in the last few years I've probably taken every reasonable possible dose for a time, from 1 gram to 150 mgs.per day, from AM only to AM & PM, to spread thru the day. For the last year (until TurNiagen changed their capsule size from 150 to 300 mgs), I'd been taking 150 mg in the AM, with occassionaly 150 mg PM. It's not the only things I take, however. Over that time, I can't say I noticed any difference with different doses, but I don't feel as though NR is something you "feel" quickly or even over weeks and months, rather (if it is effective at all) it's something that helps keep your body from falling prey to the various NAD+ related deficiencies that herald typical 'old age'. IOW, perhaps it keep you feeling younger than you otherwise would? How do you **feel** that? You don't. It's just the way you are.
One thing to note is what else do you take? I also take NMN and other NAD+ boosting supplements that either suppress NAD+ consuming processes, or augment NAD+ production. I hope that synergy adds noticeably more NAD+ to my system than NR alone. Read that to be I do not believe NR is the ONLY required molecule for healthy aging.
Over these years, I can tell you that **something** has changed in my body for the better and I no longer have joint pain and inflammation. I'm not sore in the morning, or sore even after modest to extensive exercise, I rise early each day, have energy. I don't know why exactly, because I can't go back and do it again differently to see if anything I DON'T do would change what has happened.
Regardless of what dose you decide on, my opinion, not backed by studies of supposed "benefit" is that ANY dose of supplemental NAD+ is better than none. Perhaps it only 'fills in the potholes' of NAD+ deficiency, if any exist in your metabolism. But for the small cost of any reasonable dose of NR, you really can't argue that increased NAD+ levels anywhere in your body are a bad thing, esp as you age past 40 or 50 or some age beyond youth.
Edited by Oakman, 12 January 2020 - 03:20 PM.