NYC stands for Norephedrine, Caffeine and Yohimbine hcl. This formulation was developed as a replacement/alternative to the Ephedrine and Caffeine stack. The NYC formulation is less taxing on the central nervous system and more thermogenic, especially in women through the addition of yohimbine hcl. NYC provides a more even and less "jittery" stimulatory effect and is as, if not more, thermogenic than EC. You can get it at anabolicfitness