The Effect of Dark Chocolate on Primary Dymenoreries In Students at An Nur Ngrukem Islamic Boarding School, Bantul, Yogyakarta: Pengaruh Dark Chocolate Terhadap Dismenore Primer Pada Santri Putri Pondok Pesantren An Nur Ngrukem Bantul Yogyakarta. JKMD 2023, 2 (3), 173-193.