Always fresh, never spoils. There's no chance of "spoilage spooking".

When you open a bottle of real deer pee, you are likely to smell an ammonia-like odor. This is the bacterial breakdown or spoiling. The process begins as soon as the urine leaves the deer. Many think it is one way deer determine how recently other deer have been in the area. In other words, odds are a real deer knows your real deer pee scent is old and  probably won’t work!

Buck Fever Synthetics last months and is refreshed by moisture.

Real deer pee spoils & lasts for a matter of hours before it is gone. Buck Fever Synthetics lasts for months because there is no bacterial breakdown. Buck Fever Scents crystallize only to revert back to its liquid form with rain or other moisture.