When you want pure estrous urine and nothing else, choose Code Blue's doe estrous urine. Featuring Code Blue's proprietary from One Deer to One Bottle process, where urine is collected from an individual deer, this product is assured to be 100% pure. A buck can only trail one deer at a time, so with urine collected from a single doe in heat, you'll get unmatched true-to-life effectiveness that rutting bucks can't resist.