In this study, 16 premenopausal women with uterine fibroids of varying sizes aged over 40 years old were given doses of Epigallocatechin gallate, Vitamin B6 and Vitamin D daily for 90 days. The women were selected based on specific criteria including their fibroid size and lack of other causes for abnormal uterine bleeding. Each woman kept a detailed daily diary recording details about their bleeding and pelvic pain.

The analysis of the data revealed that there was a noteworthy decrease in both the average size of fibroids for each woman and the size of individual fibroids. This effect was especially pronounced in women with predominantly intramural fibroids in comparison to subserosal fibroids. While menstrual cycle duration and intensity did not change, the length of menstrual flow was decreased. Uterine and ovarian volume as well as endometrial thickness did not exhibit any significant changes. The treatment was generally highly satisfactory to the participants, with no adverse effects reported.