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  1. Prostate Cancer, Nutrition, and Dietary Supplements (PDQ®) - PDQ Cancer Information Summaries - NCBI Bookshelf 
    https://www.ncbi.nlm.nih.gov/books/NBK83261
    ... Green tea ( Camellia sinensis [L.] Kuntze). Hu zhang ( Polygonum cuspidatum Siebold & Zucc.). Chinese goldthread ( Coptis chinensis Franch.). Barberry ( ...
  2. Prostate Cancer, Nutrition, and Dietary Supplements (PDQ®) - PDQ Cancer Information Summaries - NCBI Bookshelf 
    https://www.ncbi.nlm.nih.gov/books/NBK83984
    ... Turmeric. Ginger . Holy basil. Green tea. Hu zhang ( Polygonum cuspidatum ). Chinese goldthread. Barberry. Oregano. Baikal skullcap. The herb ... to cancer treatment have generally been studied for safety and effectiveness through a scientific process that includes ...