Effect of Foeniculum vulgare (fennel) on vaginal atrophy in postmenopausal women: A double-blind, randomized, placebo-controlled trial.

Objectives This study was conducted to evaluate the effects of orally administered fennel on vaginal atrophy. Materials and methods In this double-blind, randomized, placebo-controlled trial, 60 postmenopausal women living in Mashhad, Iran, were randomly divided into an oral fennel group (n = 30) and a placebo group (n = 30). The Maturation Vaginal Index and maturation values were measured once at baseline and again upon a three-month follow-up. Results The paired t-test showed statistically significant changes in the Maturation Vaginal Index (i.e. a decline in the parabasal cells and an increase in the intermediate and superficial cells) and maturation values in both the fennel and placebo groups at the end of the trial compared to at baseline. Nonetheless, no significant differences were observed in the percentages of the parabasal (P = 0.191), intermediate (P = 0.219) and superficial (P = 0.82) cells, which was also the case for the maturation values (P = 0.64). Conclusion Fennel had no significant positive effects on vaginal atrophy in postmenopausal women. Nonetheless, more studies are recommended to be conducted using higher doses of fennel and larger sample sizes so as to verify the results of this study.