You've probably eaten it already, it's used for vanilla (so it can say natural flavorings and not that phony vanillin) and strawberry tastes.

Millions of people across the globe are eating "beaver butt" and don't even know that they're consuming such a substance.

It's called "castoreum," and it's emitted from the castor sacs within the animal's anus. For a beaver, this slimy brown substance is used to mark its territory, but for us humans, it's used as an additive that is often labeled as "natural flavoring" in the foods we eat - vanilla, strawberry and raspberry probably being the most common. http://www.naturalnews.com/042950_b..._castoreum.html

Also:
https://en.wikipedia.org/wiki/Castoreum

What I want to know is this:

What brave soul walked up to a beaver, bit his butt, and said, "Hmm, that tastes like vanilla"?????????

Bob

I'd still like to know what Swerve calls Natural Flavorings

The U.S. Code of Federal Regulations describes a "natural flavorant" as:

the essential oil, oleoresin, essence or extractive, protein hydrolysate, distillate, or any product of roasting, heating or enzymolysis, which contains the flavoring constituents derived from a spice, fruit or fruit juice, vegetable or vegetable juice, edible yeast, herb, bark, bud, root, leaf or any other edible portions of a plant, meat, seafood, poultry, eggs, dairy products, or fermentation products thereof, whose primary function in food is flavoring rather than nutritional https://en.wikipedia.org/wiki/Natur...tural_flavoring

Which means they could use cat urine and list it as a Natural Flavor.