New emerging research clearly connects the microbiome with hair health and hair loss. The microbiome is the collection of bacteria microbes, fungi, viruses, and yeast that live in and on the surface of the body comprising 80% of our immune system. They can be found inside the nose and mouth, on the skin, in the gastrointestinal tract, in the urogenital tract, and in the newly discovered scalp-hair-follicle microbiome. Each site has unique microbes living on it, due to the differences in the environment that the bacteria can grow on. They can influence everything from gene expression, hormone production, mood, nutrient absorption, food cravings, and more for our overall health and wellness. Imbalances in the microbiome can cause systemic inflammation, illness, and inevitably hair loss.