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Boric acid is a chemical substance with mild antiseptic properties.
1 Diluted boric acid is commonly used as a suppository inserted in the vagina to treat yeast infection . 2 Several commercial douching products contain boric acid. Boric acid also has antiviral activity. Topical diluted boric acid ointment in the form of sodium borate has been used to shorten the outbreak of cold sores in a double-blind trial. 3 Duration of cold sores was approximately four days with boric acid but six days with placebo.