Also known as: Valeriana officinalis. Uses: Sleeping problems, nervous anxiety and tension, stress. Description: This is a herb which is widely found across Europe. It is one of the oldest herbs in use and has been the subject of extensive research. How it works: The tranquillising action of Valerian has been attributed to a number of components, including a group of compounds known as valepotriates, which have been shown to possess an ability to calm the nerves. Valerenic acid, found in Valerian, inhibits the breakdown of GABA, which is a chemical transmitter that decreases nervous system activity. Increasing GABA levels in this way helps people who find it hard to switch off, and promotes good sleeping patterns. In addition, a number of other constituents in Valerian have been shown to possess antispasmodic activity in muscles. Additional advice: No restrictions to use are known.