PRL and Infertility: The recent study conducted by Pedachenko et al. (2021), which included 72 infertile women with endometriosis and 77 infertile women without endometriosis, also confirmed that the baseline prolactin concentrations were significantly higher in infertile women with endometriosis (16.9 ± 5.7 ng/mL) compared to the prolactin levels in infertile women without endometriosis (15 ± 4.3 ng/mL; p = 0.023) [18].