Niacin helps me, but I seem to be very bad at taking it before sexual activities. I'm dating someone and I went to her house yesterday and we had sex for the first time. Unfortunately, while I took claritin before hand, I didn't take niacin. The brain fog hit me like a freight train about an hour afterwards. Now I'm foggy again. I hope I can plan better in the future, but I don't have a good history of it. Just ordered some extended release niacin.
IN the meantime, I wonder if there is anything I can do to combat the POIS brain fog. I haven't found anything. Only thing I've found that works reliably is niacin, but it has to be taken beforehand.