Fructose 6-phosphate (F6P) is a key phosphorylated sugar intermediate in central metabolic pathways. It is an ester where a phosphate group is attached to the 6-carbon of the fructose molecule. This compound exists in both open-chain and furanose forms in aqueous solution and is a fundamental metabolite in living cells. Its primary role is in biochemistry and life science research. Fructose 6-phosphate is a crucial substrate and intermediate in both glycolysis and gluconeogenesis. It is converted to fructose-1,6-bisphosphate by phosphofructokinase-1, a major regulatory step in glycolysis. Conversely, in gluconeogenesis, it is formed from fructose-1,6-bisphosphate. It also serves as a precursor in the pentose phosphate pathway and is involved in the biosynthesis of amino sugars and bacterial cell wall components. As such, it is widely used as a standard, substrate, or reagent in enzymatic assays, metabolic studies, and biochemical research to investigate carbohydrate metabolism and related disorders. The compound is typically handled as a stable salt, such as the disodium or barium salt, for laboratory use. It is considered hygroscopic and should be stored under appropriate conditions to maintain stability for research applications.