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  1. Essiac/Flor Essence (PDQ®) - PDQ Cancer Information Summaries - NCBI Bookshelf 
    https://www.ncbi.nlm.nih.gov/books/NBK66061
    ... Br.), blessed thistle ( Cnicus benedictus L.), red clover ( Trifolium pratense L.), and kelp ( Laminaria digitata [Hudson] Lamx.).[ ... lignans that have shown anticancer activity; red clover ( Trifolium pratense L.) contains a complex mixture of phytoestrogens, ...