Valerian Root is an herb that is said to evoke a euphoric, playful feeling similar to catnip. These toys also contain other Bavarian-grown ingredients including lavender, anise, organic spelt, and sometimes, catnip. The ingredients are lab-certified to be a pharmaceutical grade which is the highest grade possible. The cat toys use organic spelt as a filler to cushion the toys...instead of poly fibers or plastic. The spelt also serves to keep the Valerian herb fresh which ensures that the toy has long-lasting appeal.