KZ soap is a medicated soap, used to treat fungal and yeast infections. Fungal infections are common because fungi surround us in the environment and they are part of the natural flora of the skin. KZ soap is an antifungal soap that contains ketoconazole as an active ingredient. Certain activities lead to the outgrowth of fungal infections. Ketoconazole present in KZ soap inhibits the synthesis of chemicals in fungi and thus inhibits their growth.