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  1. Essiac/Flor Essence (PDQ®) - PDQ Cancer Information Summaries - NCBI Bookshelf 
    https://www.ncbi.nlm.nih.gov/books/NBK66061
    ... herbs as Essiac, plus four potentiating herbs: watercress ( Nasturtium officinale R.Br.), blessed thistle ( Cnicus benedictus L.), red clover ( Trifolium ... the herbs found in Flor Essence alone, watercress ( Nasturtium officinale R.Br.) contains phenethyl isothiocyanate (PEITC), which has shown cytotoxic ...