Boric acid suppositories are a medication that can help promote a balance of acid in the vagina and treat vaginal yeast infections by relieving symptoms like itching and burning. They may also be helpful for resistant or recurrent vaginal infections when combined with a prescription antifungal or antibiotic. However, doctors advise against using boric acid suppositories for vaginal odor or discomfort. Boric acid is a white, crystalline chemical substance that has antifungal and antiviral properties. It is important to follow the instructions on the label to safely use this medication. If you are pregnant, do not use vaginal boric acid treatment. Boric acid is only known to sometimes cause skin irritation when used in capsules as a vaginal suppository. However, more research is needed to find out how well boric acid works. If you have questions about using boric acid suppositories, it is best to consult with your healthcare provider or pharmacist.