Enables L-xylulose reductase (NADP+) activity. Involved in glucose metabolic process. Acts upstream of or within NADP metabolic process and xylulose metabolic process. Located in brush border and microvillus. Is expressed in adrenal gland; alimentary system; genitourinary system; respiratory system; and thymus. Human ortholog(s) of this gene implicated in pentosuria. Orthologous to human DCXR (dicarbonyl and L-xylulose reductase). [provided by Alliance of Genome Resources, Apr 2022]