Zero Calorie Peanut Flavoring?

There was a post, I dont remember where, about a liquid, non caloric peanut butter flavor you can add to your shakes. Does anyone know where this is?

I know I can just add natural peanut butter.

DaVinci makes a sugar-free PB flavored “syrup” that’s very good. PB flavored baking extracts you add by the drop are probably available too. (Just about any flavor is it seems.)

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