Eubiosis is a term used to describe a state of balance and harmony in the composition and function of microbes inhabiting a particular environment, such as skin, gut, or vagina. In the gut, for instance, eubiosis is characterized by beneficial microbes such as Bifidobacterium, lactic acid bacteria, or probiotics that produce beneficial components (such as SCFAs or vitamins) to support gut and overall health. In a eubiotic state, beneficial bacteria outnumber harmful microbes (Gagliardi et al., 2018).