Although the level of evidence for the effects of vitamin D on vaginal health is low in our study , we concluded that vitamin D may improve the vaginal health of women , especially during menopause
Menopause is associated with the onset of climacteric symptoms due to low estradiol levels , which may cause insufficient maturation of the vaginal mucosa .
Vitamin D may regulate the growth and differentiation of cells that are adversely affected due to low estradiol levels , thereby restoring vaginal health .
The objective of this systematic review , the first on this subject , was to investigate the effect of vitamin D on the  vaginal health of menopausal women .
The effect of vitamin D on vaginal atrophy in postmenopausal women
Background : Most of the women suffer from vaginal atrophy and dryness , and therefore , efficient and safe treatment is needed to improve vaginal lubrication . Vitamin D has several important functions which may be effective in proliferation and repair of the epithelial tissue . This study aim ed to evaluate the effect of vitamin D vaginal suppositories on maturation index , pH , and dryness in postmenopausal women . Material s and Methods : Women were enrolled in this double-blind clinical trial , in whom menopause occurred at least one year ago . Those women who had an abnormal Papanicolaou smear , had undergone hormonal treatment , or have had vaginal infection in the previous year were excluded . Forty-four women who found eligible were r and omized into two equal groups , the treatment and control groups , which received vitamin D and placebo vaginal suppository daily for 8 weeks , respectively . Vaginal pH and maturation value were measured at the beginning and end of the study . Pain , dryness , and paleness were assessed before treatment and at the end of the 2 , 4 , and 8 weeks of treatment . Results : In the treatment group , the number ( Mean ± SD ) of superficial cells increased ( 69.76 ± 12.4 ) and vaginal pH decreased ( 1.42 ± 0.67 ) significantly compared to the control group after 56 days . The mean pain significantly reduced after 8 weeks in the treatment group ( 1.23 ± 0.53 ) compared to the control group 1.95 ± 0.74 ( P < 0.001 ) . The mean of dryness and paleness reduced significantly in the treatment group versus control at 56 days . Conclusions : Vitamin D is effective in improving the maturation index and decreased the pH and dryness of the vaginal atrophy due to menopause
Although the level of evidence for the effects of vitamin D on vaginal health is low in our study , we concluded that vitamin D may improve the vaginal health of women , especially during menopause
Menopause is associated with the onset of climacteric symptoms due to low estradiol levels , which may cause insufficient maturation of the vaginal mucosa .
Vitamin D may regulate the growth and differentiation of cells that are adversely affected due to low estradiol levels , thereby restoring vaginal health .
The objective of this systematic review , the first on this subject , was to investigate the effect of vitamin D on the  vaginal health of menopausal women .