Blue vervain is a medicinal plant. It alleviates anxiety and stress by producing a calming effect on the nervous system. Blue vervain tea keeps the gut healthy and helps in preventing digestive disorders. Filled with an intense mood improving properties, this herb helps in easing the anxiety and mood swings experienced by women during the premenstrual period. It has anti-inflammatory and analgesic properties in it which may help to treat cold and flu. It also acts as an excellent liver tonic.