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Permethrin
Permethrin is virtually non-toxic to humans and no systemic effects have been reported. In EPA and FDA tests, it was uncommon to have any skin reddening, rash or other irritation. When used as a repellent, permethrin is applied to exterior clothing where it dries and bonds to the cloth fiber. This water-based formula is non-staining, odorless and has exceptional resistance to degradation by sunlight (UV), heat and water. Although permethrin is approved for skin application under certain circumstances such as head lice formulas, it is not applied to skin as a repellent. Permethrin does not bond to skin (stick) and is quickly deactivated by skin's esterase action into inactive compounds. Because of these attributes permethrin offers no repellent benefit on skin. It is only effective when used as a clothing treatment.
Deactivation of permethrin on skin occurs in approximately 20 minutes; however, when placed on clothing, it tends to last up to 6 weeks and even lasts through weekly launderings. With the long history of success permethrin has achieved, it is best not to second guess these extraordinary results. By following the directions provided on the product you can be assured of results that achieve protection at or near 100%. Any variation of instructions that indicate using less permethrin on clothing will result in diminished performance. Follow the direction exactly and you will be amazed at the performance of this product.
Test on ticks conducted in Massachusetts concluded that 100% protection was provided against the blacklegged or "deer" tick (Ixodes scapularis) which is the primary vector of Lyme disease in the Midwest and Northeast. The same outstanding results occurred when testing the Western Black Legged tick, Lone Star tick, American Dog tick and Brown Dog tick. Similar results have been found with other tick species throughout the United States and Europe. Two detergent washings did not diminish repellent killing action of permethrin-treated clothing. In tests, ticks that crossed only 10 inches of treated fabric fell from the treated clothing, later dying due to this limited exposure.
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