This rejuvenating soap that originated in Japan is a byproduct of mushroom and rice wine (saki). Its main active ingredient is Kojic acid Dipalmitate, is responsible for the exfoliating dead skin cells and brightening of the skin. - See more at: http://dr-alvin.com/index.php/en/skin-care/whitening-products/wp-soaps/kojic-acid-soap-detail#sthash.KstUlgBb.dpuf