Rhubarb Extract Details Product Name: Rhubarb Extract Herb Source: Rheum palmatum L., Rheum tanguticum Maxim. ex Balf., Rheum officinale Baill. Part Used: Root Active Ingredients: Emodin, Chrysophanol, Rhein  Specifications: Emodin 20%-98%  Test Method: HPLC  Appearance: Brown powder  CAS#: 481-74-3 (Chrysophanol), 518-82-1 (Emodin), 478-43-3 (Rhein)   Pharmacology: Rhubarb is used primarily for digestive complaints including constipation, diarrhea, heartburn, stomach pain, gastrointestinal …