A healthy vaginal environment is naturally acidic (around pH 3.8–4.5), maintained by beneficial bacteria called lactobacilli. Things like menstruation, sex, antibiotics, or hormonal changes can shift this balance, allowing less favourable bacteria or yeast to take hold — often leading to symptoms like odour, discharge, or irritation.
Boric acid suppositories work by helping restore that acidic environment, creating conditions that are inhospitable to the bacteria and yeast associated with bacterial vaginosis and recurrent thrush. This supports the vagina's natural flora in re-establishing balance.