Known history of Gilbert's syndrome Abnormal glucuronidation of bilirubin, known Gilbert's syndrome Subjects with Gilbert's syndrome; Participants with Gilbert's syndrome will be eligible for the study Have a history of Gilbert's syndrome. Known history of Gilbert's syndrome. Known history of Gilbert's Syndrome. Patients with Gilbert's disease. Bilirubin =< 2 X ULN (3 X if known history of Gilbert's syndrome) Patients with known Gilbert syndrome are not eligible History of Gilbert's syndrome Known or suspected Gilbert's disease at the time of randomization. History of Gilbert syndrome History of Gilbert's syndrome Known Gilbert's syndrome Known history of Gilbert's Syndrome or any current hyperbilirubinemia of any cause Has a known history of Gilbert's Syndrome Diagnosis of Gilbert's disease History of Gilbert's syndrome History of Gilbert's syndrome. History of Gilbert's syndrome History of Gilbert's syndrome. 4. Known history of Gilbert's Syndrome. Patients who have a diagnosis of Gilbert's disease