“…One of the advantages of co-loading natural active ingredients with chemotherapy drugs is to reverse MDR. Many natural components, such as resveratrol (RES) (Zhang et al., 2016b ), tetrandrine (TET) (Liao et al., 2019 ; Li et al., 2020e ), epigallocatechin gallate (EGCG) (Cheng et al., 2016 ), pachymaric acid and dehydrotudouic acid (PT) (Li et al., 2020f ), quinine hydrochloride (QN) (Shen & Qiu, 2017 ), β-ELE (Zhang & Guo, 2021 ), ferulic acid (FA) (Muthusamy et al., 2016 ), naringin (Jabri et al., 2019 ), baicalein (BCL) (Li et al., 2018b ), Que (Lu et al., 2020b ) and Sch B (Wang et al., 2017 ), could inhibit MDR by inhibiting the ABC transport, including P-gp, BCRP, ABCB1, etc. In addition, natural components can also inhibit MDR effects by inhibiting epithelial-mesenchymal transition through other pathways, such as RES (Buhrmann et al., 2015 ; Xu et al., 2017b ), EGCG (Yuan et al., 2017 ) and BCL (Yu et al., 2017 ).…”