Hi all,
I also had a chance to test Niacin on myself. On Thursday, I took 300 mg of Niacin on a mostly empty stomach, about 40 minutes before O. The 'flush' came on pretty quickly (within 5 minutes or so); it was definitely quite noticeable and lasted about an hour--continuing for about 20 minutes after the O.
Results:
The O was at 6:00 pm. In the hour or so immediately following the O, I felt better than usual. I didn't feel the usual initial feelings of POIS 'creeping up.' So that was a positive start. However, later in the evening, I was feeling a bit out of it, so I began to think that the niacin hadn't prevented POIS.
However, when I woke up the next morning (Friday), I found that I did NOT have the usual POIS brainfog and emotional/cognitive fatigue. I would say that the POIS feelings were only at about 15-20% of their usual. It was certainly a noticeable difference, so perhaps the niacin was effective! Moreover, the 15-20% lasted throughout the whole day.
So, I would so that the initial experiment was a success. I'm not sure what accounted for the less-good feelings of the later evening of Day 0, but Day 1 was certainly a big improvement. Did the niacin simply shorten the POIS episode, so that it mostly ended while I slept on Thursday night? Or perhaps it prevented POIS entirely, while the problems of the Day 0 evening were not POIS, but a reaction to the niacin.
In any case, I will need to test it again. Perhaps I should use a little less niacin, since a one-hour flush seems a bit long. But, it will be good to see if the overall effect is replicable, and if so, how the dosage affects things, and also whether being 'in flush' right at the moment of O makes a difference.