that 50% DEET offers longer protection but is not available in some countries.

Concentrations

The concentration of DEET in products may range from less than 10% to nearly 100%, but concentrations greater than 50% do not increase the duration of protection. Higher concentrations can be safely applied to clothing, although it may damage some types of synthetic fibers. The United Kingdom's publicly funded healthcare system, the National Health Service (NHS), recommends that UK citizens

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