Red Clover / Rotklee

Red Clover contains the highest concentration of isoflavones of any plant — particularly formononetin, biochanin A, daidzein, and genistein. These phytoestrogens bind oestrogen receptors with weak agonist/antagonist effects, showing complex anti-cancer activity that varies by cancer type and hormonal status. In breast cancer, red clover isoflavones competitively inhibit oestrogen receptor binding (protective in ER+ cancers when used correctly). In prostate cancer, biochanin A and formononetin inhibit 5-alpha reductase, reduce PSA, and induce apoptosis in LNCaP cells. Multiple RCTs show red clover significantly reduces hot flushes in breast cancer survivors on tamoxifen — a major quality-of-life benefit. Biochanin A is particularly potent: it inhibits CYP1B1 (an enzyme that activates carcinogens in breast tissue) and blocks the P-glycoprotein drug efflux pump that causes multidrug resistance.