Valarian has been used since it was discovered by the ancient Greeks but there has been a dramatic upsurge in interest in it in the last 20 years with over 200 scientific studies published on in chemistry and possible applications as a adaptogen and relaxant, promoting even mood and deep restful sleep. Lamberts Valerian is one of the purest, highest potenct extracts available at 1600mg which is equivilant to 400mg of pure extract per tablet.