The theory of multicyclic development of follicles during the menstrual cycle prompted new approaches to ovarian stimulation such as double stimulation within the same menstrual cycle, in both follicular and luteal phases. New stimulation approaches, together with cryopreservation techniques, provide higher chances for patients with poor ovarian response who undergo in vitro fertilization (IVF) to get pregnant. The double ovarian stimulation protocol has been proposed to optimize the number of oocytes retrieved within the shortest possible timeframe. Moreover, the short overall duration of this strategy is also useful in cases of a fertility preservation that requires rapid intervention before administering a gonadotoxic therapy, such as in oncologic therapy. In general, the aim of DUOSTIM is to obtain the highest number of oocytes in the shortest time, thus avoiding waste of time, which is crucial for these patients. Several protocols have been proposed with similar results, regardless of the protocol used.