Blue Vervain comes from the flowering tops of Verbena hastata and related plants. People take it to ease nervous tension, encourage relaxation, and aid sleep. It is available as a liquid extract, dried herb in capsules, or as a tea. Many use it before bed or during stressful times.
Modern clinical evidence for its effects is limited. Most knowledge rests on historical tradition. Blue Vervain may interact with blood pressure medications and blood thinners. Talk to a healthcare professional before use.