Mannose is a sugar with the formula HOCH2(CHOH)4CHO, which sometimes is abbreviated Man. It is one of the monomers of the aldohexose series of carbohydrates. It is a C-2 epimer of glucose. Mannose is important in human metabolism, especially in the glycosylation of certain proteins. Several congenital disorders of glycosylation are associated with mutations in enzymes involved in mannose metabolism.D(+) Mannose 99% For Biochemistry is an ultra-pure, naturally occurring aldohexose sugar primarily used as a vital carbon source, cellular substrate, and reference standard in biochemical, microbiological, and glycobiology research. The “For Biochemistry” designation ensures the carbohydrate is free from interfering trace sugars, heavy metals, and enzymatic inhibitors that could compromise metabolic or cellular assays.