Fructooligosaccharide (FOS) is 100% natural carbohydrate fiber in powder or liquid form. It is a functional food ingredient and is recognized as safe in USA, Japan, Europe and Asia as dietary supplement or sugar supplement. FOS had been successfully applied in foods, beverages, functional food and pharmaceutical products for its unique healthy value. Yunehing FOS is short chain FOS, which compose of GF2, GF3 and FG4 only through high-tech biochemical manufacturing.