http://www.prnewswire.com/cgi-bin/stories.pl?ACCT=104&STORY=/www/story/07-31-2008/0004859574&EDATE= I am posting this link due to the tendency of people on this site and others to assume a product marketed as "natural" or "organic" means safer. This is an interesting article that confirms many of my suspicions. Natural pyrethrins are no more safe, and may even be more dangerous, than many of the organophosphates that have been around and extensively tested for years. This is a quote from the study: While pyrethroids are generally believed to be less toxic than organophosphates, the number of reported human health problems, including severe reactions and even deaths attributed to pesticides containing pyrethrins and pyrethroids, increased from 261 in 1998 to 1,030 in 2007, nearly a 300 percent increase. Pyrethrins and pyrethroids accounted for more incidents than any other class of pesticide over the last five years. EPA data shows at least 50 deaths attributed to this supposedly safer class of pesticides since 1992. While organophosphates have been extensively studied and their impact on public health thoroughly documented, researchers and scientists are still unsure of the long-term neurotoxicity of pyrethrins and pyrethroids, particularly among children and those susceptible to allergies. Even so, the EPA does not require product warning labels cautioning consumers with allergies of the dangers associated with pyrethrins and pyrethroids products. However, the Food and Drug Administration does require warning labels on shampoos that contain pyrethrins and pyrethroids.