Activated charcoal is like a super sponge that can soak up things in your tummy that might make you feel yucky. It's like when you spill juice on the table and you use a paper towel to soak it up.
When you drink the activated charcoal cleanse, it goes into your stomach and starts absorbing all the bad things that might be in there like toxins or old food. Then when you use the potty, all those yucky things come out too.
It's like giving your tummy a big cleaning so you feel better and less gross inside. Just like when you clean your room, it feels better and looks nicer after! But make sure you only drink the activated charcoal cleanse when a grown-up says it's okay because they know best.