SynergyLabs 100% Natural Extreme Catnip Leaf - 1 oz. (28.4 g) Pouch Synergy Labs 100% Natural Xtreme Catnip Leaf provides more crazy fun than any other catnip! Synergy Labs 100% Natural Xtreme Catnip Leaf is cultivated by a world renowned grower of herbs in the high altitudes of North America. High altitudes foster larger concentrations of catnip oil resulting in extreme potency. Sprinkle Synergy Labs 100% Natural Xtreme Catnip Leaf on anything or stuff it in a toy or old sock and watch the crazy fun begin. Fun Catnip FactsCatnip evokes different responses in cats - purring, licking, rolling, rubbing, jumping and running. The reaction usually lasts from 5 to 15 minutes. An inherited gene controls the different responses cats have to catnip. Approximately 15% of all cats do not possess the gene needed to respond to catnip. Cats less than 6 months old rarely respond to catnip. Catnip, added to food, will often coax a finnicky cat to eat.