Collagen and Your Gut Health: What Does the Science Actually Say?

Dr. Will Bulsiewicz

23 March 2026

Collagen supplements are everywhere. They’re one of the most popular supplements in the world. And millions of people are taking them specifically for gut health. But is there evidence to support that? And how does collagen compare to prebiotic fiber when you look at the actual published research? Let's walk through the science on both sides. You might be surprised by what I found. More info on the science of farts: https://youtu.be/QIlpJh_0ESY