The human microbiome is a term used to describe the large communities of microbes that coat the human body, inside and out. Invisible to the human eye, this extraordinary ecosystem is made up of a diverse collection of bacteria, fungi, viruses and parasites, that is as unique to you as your fingerprint. When in balance, the microbiome coexists peacefully with your body, supporting health like a functioning organ. Changes to this balance can affect your general health and wellbeing.