Siberian Eleuthero is a superior tonic herb, shown to be effective for athletes and active people for supporting their levels of energy and stamina. We source only the very best mature roots and process them into a liquid extract which is dried into a concentrated powdered extract. It takes 10 pounds of pure root to make one pound of our 10:1 concentrated extract powder which is much more easily absorbed for better nutritional support. Independent Laboratory assayed for guaranteed potency.