Lemon balm (Melissa officinalis) is an herb that impedes the spread of a number of viruses, including the virus that causes cold sores (herpes simplex). According to a German study of subjects with cold sores and genital herpes, it was discovered that a topical cream containing one percent lemon balm extract, applied five times per day relieved symptoms and reduced the size of the occurrence, seemingly by inhibiting healthy cells from becoming infected with the virus. Sixty percent of subjects reported that their cold sores were healed within four days. And by day eight, ninety-six percent were healed. You can find creams that contain lemon balm at the health store; however, if you can get fresh lemon balm, you can make a compress or poultice from the leaves.
Dosage information: 3 to 4 cups of tea per day (steep 1 to 2 teaspoons of dried leaves in 1 cup of hot water for 10 minutes); or up to nine 300 to 400 milligram capsules per day; or essential oil of lemon balm applied directly to lesions three to five times per day. Caution: Do not take the essential oil internally.
References: The Herbal Drugstore written by Linda B. White, M.D., and Steven Foster