Niacin CRT™ is a unique wax-matrix tablet, which utilizes the latest Controlled Release Technology (CRT) technology. This technology delivers niacin in a continuous, controlled rate over a 6-8 hour period, throughout the tablet’s transit time in the bowel. Flushing sometimes happens with time-release niacin, as there can be fairly large surges of niacin released intermittently. However, flushing is less likely with controlled release niacin.