The Effect of Vitamin D Deficiency on Overgrowth of Uterine Fibroids: A Blinded Randomized Clinical Tria

Document Type : Original Article


1 Department of Obstetrics and Gynecology and Reproductive Endocrinology, Vali- asr Health Research Center, Vali- asr Hospital, Tehran University of Medical Sciences, Tehran, Iran

2 Department of Obstetrics and Gynecology, Yas Hospital, Tehran University of Medical Sciences, Tehran, Iran

3 Department of Community Medicine, School of Medicine, Tehran University of Medical Sciences, Tehran, Iran

4 Department of Radiology, Yas Hospital, Tehran University of Medical Sciences, Tehran, Iran

5 Department of Anesthesiology, Yas Hospital, Tehran University of Medical Sciences, Tehran, Iran


Background: To evaluate the effects of vitamin D (vitD) supplement on uterine fibroid growth.

Materials and Methods: A randomized blinded clinical trial was conducted at a tertiary university-based hospital
from August 2017 to September 2018. Totally, 204 women were enrolled into the study. They had at least one uterine
fibroid >10 mm on transvaginal ultrasound and their vitD level was insufficient (i.e. 20-30 ng/ml). The intervention
group was treated with vitD 50000 U supplements for two months. After 2 months, ultrasound screening and vitD
level measurement was done in both groups.

Results: At first, the mean serum vitD levels in intervention and control group were 23.62 and 23.20 ng/ml, respectively.
After 8 weeks, the mean serum vitD levels in the control and intervention group were 22.72 and 28.56 ng/ml
respectively (p <0.05). Also, mean fibroma diameter in the intervention group before and after 8 weeks of vitD supplementation
was 43 ± 4.68 and 42.6 ± 1.31 mm, respectively. Mean uterine fibroid diameter in the control group which
did not receive vitD supplements, before and after 8 weeks was 41.98 ± 5.25 and 47.81 ± 3.42 mm, respectively. The
variation in the mean size of the uterine fibroid between the control and intervention group which was respectively
about 5.83 mm increase and 0.48 mm decrease, was significant (p <0.001).

Conclusion: Our results showed that vitD supplementation prevents fibroid growth. It seems that vitD supplement
is a simple, safe and inexpensive modality for leiomyoma growth prevention (Registration number:


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