GFO is a powdered drink mix that contains three nutrients.
The name GFO is derived from the acronym for glutamine, fiber, and oligosaccharides.

Glutamine

Glutamine is a kind of amino acids and the most abundant amino acid found in the body. Especially, it is consumed much in the intestinal tract and is a source of energy for the intestinal tract.

Fiber (partially hydrolyzed guar gum)

Fiber is a water-soluble dietary fiber made from guar beans, and is utilized by intestinal bacteria.

Oligosaccharides (fructooligosaccharides)

Fructooligosaccharides are used as the oligosaccharides.
Oligosaccharides are said to be food for bifidobacteria, which are generally considered to be good bacteria. They are carried to the large intestine without being digested.
* They can be taken by people with lactose intolerance