Never said it was natural and why you’d tell someone to test it on their tongue is ridiculous.
If someone doesn’t want mosquito bites, there are not a lot of options and West Nile is probably not fun either.
When I say a tongue test, I don’t mean gulping the stuff. It’s just an interesting effect...and if it were as dangerous as you imply, it would not be for sale.
...and with this bunch in DC, don’t bet on it being around much longer. Time to stock up (the black market will be AWESOME).