I compost and a common practice is to throw a handful of your native soil into your pile when you start it, to inoculate it with local soil bacteria. Bacteria do most of the work in an active compost pile.
I wonder if people were getting some kind of gut flora benefit from this.
The most likely explanation is that kaolinite clay is known to reduce nausea and diarrhea.
https://www.frontiersin.org/journals/public-health/articles/10.3389/fpubh.2022.893831/full
I compost and a common practice is to throw a handful of your native soil into your pile when you start it, to inoculate it with local soil bacteria. Bacteria do most of the work in an active compost pile.
I wonder if people were getting some kind of gut flora benefit from this.
Depending on the composition of the soil it might also have antiparasitic properties.
Or they could be beneficial parasites, like that episode of the space show.