“…The patients' serum was not more inhibitory than normal serum to the formation of directreacting bilirubin by rat liver slices. As indicated in Table IV (33,34). In other studies, however, after ingestion of menthol, patients with mild chronic unconjugated hyperbilirubinemia required a longer time than normal controls to excrete menthol glucuronide in the urine, although the total amount excreted during a 6-hour period was the same in both groups (57).…”