Ethyl lactate is a non-GMO corn oil byproduct. Ethyl lactate is listed by the US FDA as Generally Recognized as Safe (GRAS). As the surfactant in Flea & Tick Spray for Yard + Garden, Flea and Tick for Yard+Garden, Outdoor Pest Control for Yard + Garden and Home & Garden, ethyl lactate allows the cedarwood oil to mix with water. When mixed, the concentrate becomes ready to use.