How long does it take for niacin to work. The recommended daily intake of niacin is about 15 milligrams for adults. If you flush beet red for half an hour and feel weird, well, you took too much. With the help and support of my daughter she insisted for me to give it a try. Dan September 3, at 1: We would need to see the results of a head to head comparison of no flush niacin and regular niacin in a double blind placebo controlled trial. Niacin is suggested for those with Pyroluria. I do feel better taking niacin but the most I can do is mg about 2 times a dayotherwise the flushing is overwhelming. Many of which I had been on and stopped out of confusion of what was helpful or not. I took him to the hospital this summer after watching him lay in bed with his legs so swollen he could not walk. Miscellaneous antihyperlipidemic agents Vitamins. Used Dr. When your body burns fat later, the THC is released and ends up in your urine. Not sure if a certain hormone had gone way up, or if a particular neurotransmitter was elevated.