Vervain is considered the herb of LOVE. The traditional use of Vervain is medicinal while others use it for ceremonial and superstitious purposes (or are they).
Herbalism is the ancient art of using the energies and medicines locked away in plants to help relieve discomfort from, or even cure, millions of conditions. Every part of plants can come in handy, ranging from mandrake root to rose petals and wild lettuce, and each provide their own advantages depending on botanical nature of the plant.
Many thousands of years after mankind uncovered the medicinal and spiritual use of these plants, scientists have acquired the tools that were needed to figure out how they worked and confirm their effectiveness. You can see an example of this in scientific articles confirming the effectiveness of elderberry improving your immune system with thousands of antioxidants and even anticarcinogenic effects!
We encourage you to do your research before ingesting any herb. This is especially true if you are taking any medications, as many herbs interact with specific types of medications (St. Johns Wort and Antidepressants for example, causes serotonin syndrome, which can be fatal). Always consult your doctor before trying to treat, diagnose, or cure any medical condition, as they know what is best specifically for you.