Health Canada is set to ban topical mosquito repellants that contain oil of citronella. The oil contains methyleugenol, a compound that has caused liver tumours in rats fed in large doses, but this really has no relevance to topical application by humans While there is no evidence of harm from any topical application, other than the rare allergic reaction, no formal studies of safety have been carried out. In this case Health Canada seems to be applying the letter of the law. Insecticides, whether natural or synthetic, are regulated by Canada’s Pest Management Regulatory Agency (PMRA) which is distinct from the Natural Products Directorate. The law is that any pesticide has to be backed up by appropriate safety studies and the requirements here are far more stringent than those for natural products. The required safety studies for citronella have never been carried out because the product is not patentable and no company wants to invest the necessary funds.
Contrary to arguments voiced by some conspiracy theorists, Big Pharma, producers of DEET, is not behind the ban. Citronella isn’t a significant competitor for the simple reason that it doesn’t work very well. Basically, what Health Canada is saying to citronella repellant producers is, “hey, you are claiming your product is an insecticide, then it has to be regulated as one and the same rules apply as for any other insecticide.” And since the safety studies are not available, the law says citronella cannot be sold as an insecticide.
What is disturbing here is that Health Canada has gone after what almost certainly is an innocuous product while allowing a nonsensical homeopathic mosquito repellant, Mozi-Q, to be sold, even furnishing it with a homeopathic drug identification number. This absurdity comes about because homeopathic products fall under different regulations. There is no requirement for safety or efficacy. A ridiculous situation. Especially given that Mozi-Q presents a real risk. People apply it, believing the homeopathic hype and then go out and get bitten by a mosquito that potentially injects a non-homeopathic dose of West Nile virus.
Anyone wishing to still use citronella extracts will have purchase them in the U.S. where FDA or EPA see no problems. Don’t look for citronella in Europe though, their regulations are even stricter than Canada’s. But dog owners who have been using oil citronella to condition dogs from barking don’t have to worry, citronella scents will still be allowed for the device that hangs around their pet’s neck. And citronella extract will continue to be used extensively in the perfumery industry. Nobody smells a problem there.