Sure. Just to be clear, it goes away without Palm oil/Caprylic acid. And I shouldn't have called it "black". Rather, I should have said "dark". Which is why I asked if they stimulate bile.
They do stimulate bile synthesis and release. Usually that turns a stool greenish but it can be dark as well if the bile gets metabolized. A common test for gallbladder function used to be a 20g - 30g of fat in one sitting.