Probiotics	“Live microorganisms which when administered in adequate amounts confer a health benefit on the host”	17
Postbiotics	“Preparation of inanimate microorganisms and/or their components that confers a health benefit on the host”	18
Prebiotics	“A substrate that is selectively utilized by host microorganisms conferring a health benefit”	19
Synbiotic	“A mixture comprising live microorganisms and substrate(s) selectively utilized by host microorganisms that confers a health benefit on the host”	20
Biotherapeutic products	“Live organisms designed and developed to treat, cure, or prevent a disease or condition in humans”	21
Fecal microbiota transplant	“A treatment that involves administration of minimally manipulated microbial community from stool of a healthy donor into the patient’s intestinal tract”	22