Can gut microorganisms be beneficial? If so, which one?

A large number of bacteria live in our intestines. They also inhabit the intestines of many other animals, mainly omnivores and herbivores. They are essential for life as they help us with digestion. Our body is unable to produce all digestive enzymes. Many enzymes secrete bacteria. So food is well digested and we get enough nutrients. In the body of a cow, bacteria in the intestine are more than 2 kilograms. In our body, this is a little less than two kilograms.