Activated charcoal is just a high adsorption material with a lot more surface area (100-1000x or so) than stomach lining so anything floating around is more lik

Activated charcoal is just a high adsorption material with a lot more surface area (100-1000x or so) than stomach lining so anything floating around is more likely to be trapped by the charcoal than get absorbed by your digestive system. It works with pretty much anything, good or bad, since it exploits a basic physical process of molecules sticking together.