Loading metrics Open Access Peer-reviewed Research Article Citation: Zhou IW, Zhang AL, Tsang MS-M, Xue CC (2025) Vitamin D for primary dysmenorrhea and endometriosis-related pain – A systematic review of registered RCTs. PLoS ONE 20(4): e0321393. https://doi.org/10.1371/journal.pone.0321393 Editor: Manuel Maria Ianieri,, Mater Olbia Hospital, ITALY Received: May 16, 2024; Accepted: March 5, 2025; Published: April 21, 2025 Copyright: © 2025 Zhou et al.