Psilocybin mushrooms are kinds of mushrooms (fungi) that contain a chemical called psilocybin. When psilocybin is eaten, it can change how your brain works and give you a different kind of experience, like how you feel, how you think, and how you see the world. Some people say it helps them see things differently and helps them feel calmer and happier. It can also make you feel strange and can make people act in a way they normally wouldn’t. Eating psilocybin mushrooms can be a risky thing to do, because it’s not clear how your body or mind will react and it can be dangerous if you don’t know what you’re doing.