ResearchWhat is the optimal GnRH antagonist protocol for ovarian stimulation during ART treatment? A systematic review and network meta-analysisshare What is the optimal GnRH antagonist protocol for ovarian stimulation during ART treatment? A systematic review and network meta-analysisSeveral GnRH antagonist protocols are currently used during COS in the context of ART treatments; however, questions remain regarding whether these protocols are comparable in terms of efficacy and safety. A systematic review followed by a pairwise and network meta-analyses were performed.