Northern Gold label Hot-N-Ready lure is 100% pure lure with no preservatives added ready to use right from the bottle. Collected from whitetail deer only its then bottled within 24 hours after collection for guaranteed maximum freshness put into amber colored bottles to protect from light. Stamped with a freshness date on all packages and shipped within dates of collection. Each package of lure is intended to be used within that years deer season to insure maximum effectiveness.Surgical bottle used with inter-seal to keep out all contaminates. No need for refrigeration.