Ok.. I am going to go old school here.... Our family are avid outdoorsmen and women... As in generations... I have spent many an hour in the swamp and the woods.. Swamp....Now that is buggy.... Our family has always used 100% Deet... No side effects, no cancer... and especially.... No west nile, no lyme disease... Nothing...I am not saying Deet can't cause side effects....But in our fasmily and our friend's famalies... Nothing negative... and no bugs... 100% Deet.. It works regardless of the brand...