I kontrollerede studier af Orgalutran hvor der er anvendt en lang protokol med GnRH agonist som reference, resulterede Orgalutran behandlingen i en hurtigere follikelvækst i de første dage af stimulationen, men den sidste kohorte af voksende follikler var mindre og producerede gennemsnitligt mindre østradiol.
In controlled studies of Orgalutran, using a long protocol of GnRH agonist as a reference, treatment with the Orgalutran regimen resulted in a faster follicular growth during the first days of stimulation but the final cohort of growing follicles was slightly smaller and produced on average less oestradiol.