One of the first aromatherapy books to get really popular here in the US, and the one that many credit with helping to rocket aromatherapy to super-fad status, referred to lavender oil as an antidote to black widow venom. To be fair, the author did say, "reportedly an antidote" but, judging from the myriad blog posts out there on using essential oils for spider bites and insect stings, it's clear that many people took her words as fact. It isn't at all difficult to find amateur herbalists recommending lavender for just such a purpose, even when the spider in question is a potentially deadly one.
The truth is that no scientific studies have ever even hinted at lavender oil's supposed ability to neutralize the latrotoxins in black widow venom. And, its primary chemical components—linalool, eucalyptol, linalyl acetate and camphor—also seem to offer no known anti-venom actions.
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