yea i use the niacin all da time...it does clean out ya pores but it also makes u turn red ur skin feels like its burnin an u itch like a mofo...it dont happen till bout 45 min after u take it an lasts for bout an hours or more..the first time i tryed it it didnt work but my friend she took it an passed out after takin 2 of em dat freekd me out but i still took them the next time i took them they worked i was itchin a lot an i started to look like a big a** cherry i was red! but hey it worked but i take extra precaution an take more then im supposed to so my effects last longer but i kno its workin wen i turn red an start itchin!!