Gardenin B exhibits superior antiproliferative activity against lung, breast, colon, hepatic and leukaemia cell lines as well as in keratinocytes .Gardenin B-induced cell death in human leukemia cells involves multiple caspases but is independent of the generation of reactive oxygen species. Gardenin B can strongly inhibit biochemical production of nitric oxide (IC50=10.59±0.4 ug/mL). Gardenin B is a tetramethoxyflavone that is tangeretin in which the methoxy group at position 5 has been replaced by a hydroxy group. It has a role as a plant metabolite. It is a monohydroxyflavone and a tetramethoxyflavone. It is functionally related to a tangeretin.