A Western herb used in Europe for centuries, Valerian was known as a "heal-all" medicinal plant. Drinking its tea was said to bring peace to quarreling men in the midst of heated debate or battle. Today, Valerian is mostly used to relax the body and mind, and to assist sleep. It has a calming effect on the nerves and muscles. Valerian can be used as a post-workout supplement to relax the athlete and assist recovery.