The human gut microbiome is a term used to describe the micro-organisms (and their genetic material) within your gastrointestinal tract. These trillions of microbes go about their daily activities as you go about yours; unseen to the eye, their enterprising ways can promote— or possibly detract from—your health. These microbes regulate your immune system, manufacture nutrients, help you detoxify, protect your cells, store fat, influence body metabolism, and even directly communicate with your brain!