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Mark Fradin and Jonathan Day of the University of Florida tested 17 nationally marketed mosquito repelling products under laboratory conditions. They asked 15 volunteers to stick an arm coated with repellent into a cage containing 10 mosquitos and observed how much time elapsed before the first bite. Products containing DEET repelled best, and the more DEET they contained, the better they worked. Off! Deep Woods, which contains 23.8% DEET, provided the longest-lasting protection: 302 minutes, on average. By contrast, Avon Skin-so-Soft Bath Oil failed after 9.6 minutes, on average.
Skin-So-Soft bath oil received considerable media attention several years ago when some consumers reported it to be effective as a mosquito repellent. When tested under laboratory conditions against Aedes aegypti mosquitoes, this product's effective half-life was 30 minutes. Against Aedes albopictus, Skin-So-Soft oil provided 40 minutes of protection from bites, a duration 10 times less than that of 12.5% DEET [46]. It has been proposed that the limited mosquito repellent effect of Skin-So-Soft oil could be caused by its fragrance or the presence of diisopropyl adipate and benzophenone in the formulation, both of which have some repellent activity [40]. Avon now markets products under the Skin-So-Soft label that contain an EPA-recognized repellent (Table 5).
Now that's something you don't hear every day.