The answer lies in the amount of gelatin that it contains. The gelatin promotes gut integrity and digestive strength. In addition to containing glutamine (an amino acid that works to repair any leaks in your intestinal tract), gelatin has a unique property of drawing stomach acid into the stomach due to its glycine content. (1) Stomach acid enables the breakdown and absorption of nutrients into the body. Even if your diet is healthy, you may not be assimilating all your food if your stomach acid is low. In addition, recent studies are also linking low stomach acid levels with bacteria overgrowth. (2)
If you are wanting to support your gut health and your health in general, then bone broth is a great way to do that!
Here is a great article with more information: The Ultimate Guide to Bone Broth Benefits