 Just go through the ingredients with us. So the number one ingredient is collagen protein. We've got several different types of collagen protein in our calatrin, but it works to rebuild lean muscle tissue and rev up your metabolism. That's how it works over time. It's also good for the joint pain. And when you're taking it at bedtime, like we do recommend, it also helps break down into glycine, which helps you sleep more soundly also.