See also:

• Science: Biology: Flora and Fauna: Plantae: Magnoliophyta: Magnoliopsida: Ranunculaceae: Hydrastis: Hydrastis canadensis  (7)

• Botanical.com + A Modern Herbal - Actions, indications, habitat and preparation of hydrastis canadensis + Golden Seal.
• Goldenseal - Information about the modern and traditional uses of this herb, including discussions of the conditions it is used to treat.
• Nutrimart: Goldenseal - Information about the active substances in this herb, its traditional uses, physiology, dosage, toxicity, and other advice.