It has been about ten years since my first allergic reaction to
deet. It was swift and brutal leaving me with a crushing headache. I've been exposed enough times since then to know my body has no tolerance of the chemical. Each encounter has been very bad. On a recent visit to Florida, we found an alternative to Deet-based mosquito repellents in a product called
No Natz. It worked well, lasted for a long time before re-application was required and gave me no headaches. :)