Nobiletin is a polymethoxylated flavonoid that has been found in C. unshiu and has diverse biological activities.^1,2,3 It reduces LPS- and IFN-γ-induced increases in inducible nitric oxide synthase (iNOS) protein levels and NO production in RAW 264.7 cells when used at concentrations of 25, 50, and 100 µM.¹ Nobiletin decreases proliferation of A549 lung, B16/4A5 melanoma, CCRF-HSB-2 leukemia, and TGBC11TKB gastric cancer cell lines with IC50 values of 22, 18, 13, and 8.3 µM, respectively.² Dietary administration of nobiletin (0.3% w/w) reduces body weight, hepatic steatosis, and plasma LDL and HDL cholesterol levels in mice fed a high-fat, high-cholesterol diet for 18 weeks.³ It also inhibits increases in plasma glucose levels in an intraperitoneal glucose tolerance test in the same model.