Silydianin is a flavonolignan. Silydianin can be obtained from Silybum marianum. Silydianin inhibits PTP1B with an IC50 of 17.38 µM. Silydianin inhibits both monophenolase and diphenolase of tyrosinase significantly, with IC50s of 2.6 µM and 16.5 µM, respectively. Silydianin induces Apoptosis and reduces cytokines (IL-4 and IL-5). Silymarin has antioxidant, cytoprotective and immunomodulatory effects. Silydianin has antitumor activity against prostate cancer. Silymarin can be used in allergic asthma research[1][2][3][4][5][6][7].