It's a naturally derived insect repellent although you don't want to get in your eyes or ingest it, and like DEET based repellant, you're supposed to wash it off your skin once you get inside. It's also in Vicks vaporub, by the way. Like I said, I heard about it from a public health professional who works with vectorborne diseases. If you Google it, you'll see it's identified by the CDC, the California Department of Public health, and the National Park Service, and others, as effective deterrent. It's the ingredient that's in REPEL brand repellant.
