From http://www.1stchineseherbs.com/burdock_root.htm
"Burdock contains copper, iron, manganese, sulfur, biotin, zinc, iron, amino acids, mucilage, and vitamins B1, B6, B12, and E."
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From http://www.1stchineseherbs.com/burdock_root.htm
"Burdock contains copper, iron, manganese, sulfur, biotin, zinc, iron, amino acids, mucilage, and vitamins B1, B6, B12, and E."