“…The pathophysiologic mechanisms include an increase in the secretion of cytokines, interleukins, and growth factors; the differentiation of immune cells into macrophages or dendritic cells; and the restoration of uterine natural killer cells [ 10 , 11 , 12 , 13 ]. The results from clinical trials are conflicting [ 9 , 14 , 15 , 16 , 17 , 18 , 19 , 20 , 21 , 22 , 23 , 24 , 25 , 26 , 27 , 28 , 29 , 30 , 31 , 32 , 33 , 34 ]. As for the latter, the intervention aims to restore the asynchrony between the endometrium and the embryo status, which has been suggested to be caused by high steroids’ levels due to ovarian stimulation [ 35 ]; thus, the endometrial maturation stage appears to be more “advanced” at the time of the embryo transfer [ 36 , 37 ].…”