System Restoration Gastrointestinal Herbal Supplement Non-GMO & Gluten-Free Dry Herb / Menstruum Ratio: 1 : 5 Yellow Dock Liquid Extract We prepare our Yellow Dock Extract from the roots of Rumex crispus plants which are Certified Organically Grown or are Sustainably Wildcrafted in their natural wild habitat. To assure optimal extraction of Yellow Dock's bioactive compounds, the roots are hand-harvested only after the plants have fully seeded in summer or autumn, and are then carefully shade-dried and thoroughly extracted.