Our Cloud Nine is pure silver vine powder processed in the USA. Non-toxic Non-addictive Provides added enrichment Relieves stress and anxiety Actinidia polygama, better known as silver vine, is a longtime favorite with cats and their people in Asia. Similar to catnip, valerian root, and honeysuckle, it is one of many olfactory stimulants that help enrich the lives of cats. When exposed to silver vine cats enter a euphoric state that mimics catnip except it is more potent due to the presence of two cat attractants as opposed to catnip's one. In fact, a recent study published by BMC Veterinary Research found that while one out of every three cats did not respond to catnip almost 80% of the domestic cats responded to silver vine.