FK-23 is a heat-treated probiotic substance that maximizes the efficacy of microorganism selected from the many different microbes through heat treatment using proprietary technology. LFK is also a heat-treated probiotic, a unique substance produced by breaking down the cell walls of microbe. Inside the hard cell walls of lactic acid bacteria are nucleic acids, minerals, vitamins, and proteins. LFK is processed by enzymatically dissolving this cell wall so that the active ingredients inside the microooganism can work more efficiently.