Vervain is a plant with blue or purple flowers. The flowers and leaves have been used to ease digestion and improve symptoms of depression. Vervain has also been used to improve the flow of breast milk. It can be taken as pill, powder, or extract. It can also be made into a tea or applied as a cream. Vervain can also be used as a mouthwash and has been used to improve dental health.


There are no advised doses for vervain.


May be effective

  • Gingivitis—may improve symptoms when used with standard treatment A1
  • Sinusitis—may ease symptoms when combined with other herbs and used with standard treatment B1

Editorial process and description of evidence categories can be found at EBSCO NAT Editorial Process.


It is likely safe to use vervain on the skin and to take it orally in small doses for a short time, but skin rash may happen.C1 Not enough studies have been done to say whether it is safe to use for a long period. It is also not known whether it is safe to take by women who are pregnant or breastfeeding.


Talk to your doctor about any supplements or therapy you would like to use. Some can interfere with treatment or make conditions worse.