A randomized trial assessing the efficacy of Silymarin on endometrioma-related manifestations.

To study the effect of silymarin on the Interleukin-6 (IL-6) level, size of endometrioma lesion, pain, sexual function, and Quality of Life (QoL) in women diagnosed with endometriosis. This randomized, double-blind placebo-controlled clinical trial was performed on 70 women with endometriosis which was divided into two groups of intervention and control. The intervention was 140 mg silymarin (or matching placebo) administered twice daily for 12 weeks. The volume of endometrioma lesions, the level of IL-6 concentration in serum, pain, sexual function, and QoL were analyzed before and after the intervention. The means of endometrioma volume (P = 0.04), IL-6 (P = 0.002), and pain (P < 0.001) were reduced significantly in the silymarin group after intervention. However, the QoL and female sexual function did not improve substantially in the two groups (P > 0.05). Silymarin significantly reduced interleukin-6 levels, sizes of endometrioma lesions, and pain-related symptoms. The trial has been registered in the Iranian Registry of Clinical Trials (IRCT20150905023897N5) on 4th February 2020 (04/02/2020) ( https://en.irct.ir/trial/42215 ) and the date of initial participant enrollment was 2nd March 2020 (02/03/2020).