Probiotics are beneficial bacteria that are present in a healthy GI tract and that make up part of the intestinal microbiome (the total of all the different kinds of microbes within the gut). These living organisms normally maintain a mutually beneficial relationship with the host, bringing with them far-reaching metabolic, immunological, nutritional, and psychological benefits.<br /> Digestive enzymes are non-living, protein-based molecules made and secreted by the GI tract. They are designed to break down the proteins, carbohydrates, and lipids in the foods we eat, so that we can absorb and use the nutrients they contain for the many thousands of biological tasks the body must carry out everyday to be healthy and functional.