Vasopressin

Vasopressin is a chemical in your body that helps your body control water balance. It's like a tiny little manager that tells your kidneys how much water to keep in your body and how much to get rid of in your pee. It's also sometimes called "antidiuretic hormone" because it works against diuresis, which is when you pee a lot.

Think of vasopressin as a little traffic cop inside your body. When your brain senses that you're dehydrated or your blood is getting too salty, it sends a signal to the little traffic cop to release more vasopressin. Then, vasopressin tells your kidneys to stop peeing out so much water, which helps your body hold on to more of it.

On the other hand, if you've had too much water to drink and your body is getting too hydrated, your little traffic cop won't release as much vasopressin. That tells your kidneys to start getting rid of more water, which helps keep you from overloading on H2O.

So even though it's hard to pronounce, vasopressin is a very important chemical that helps your body keep its water levels just right.