... unique, safe and natural way to repel mosquitoes, gnats and flies. There are no chemicals, pesticides or insecticides in the patch ... unique, safe, and natural way to repel mosquitos, gnats, and flies. There are no chemicals, pesticides, or insecticides in the patch ... of vitamin b1. Research has showed that mosquitoes, gnats, and flies do not like the smell of vitamin b1 excreted through ...