L-Rhamnose is extracted commercially from natural sources such as quercitrin (from oak bark), naringin (from citrus), or rutin, by acid hydrolysis of the parent glycoside followed by purification and crystallization. It can also be produced biotechnologically by enzymatic or microbial conversion. In human nutrition, L-rhamnose is poorly absorbed in the small intestine and passes to the colon where it is fermented by microbiota, suggesting prebiotic properties.
Its metabolism produces propionic acid, which has been linked to cholesterol-lowering effects. In food technology, rhamnose serves as a flavor precursor contributing to Maillard reaction products with characteristic savory and roasted notes. Although listed in some preservative categories in manufacturer datasets, its primary regulatory status is as a carbohydrate / dietary fiber ingredient. Approved for food use in multiple jurisdictions as a novel food ingredient.