Vervain is a herb which strengthens the Nervous System and at the same time relieves tension and stress. It can be used in cases of depression and melancholy, especially when they follow a disease such as the flu. It can also be used in cases of seizures and hysteria. As a diaphoretic, it can be used during the first stages of fever. As a hepatic, it has been proven to help in cases of gallbladder inflammation and jaundice. It can be used as a mouthwash, against caries (dental cavities) and other gum conditions.