My son sat outside on the hammock and was bitten like crazy. He came inside and showed me huge mosquito bites. I immediately gave him the Bite Helper and he said "This works!" He used it on many bites. He said one bite came back to bother him a little, but he reapplied the Bite Helper and that seemed to calm things down. We love that this has no chemicals and is easy to use. We can take it anywhere!