* Root Extract Powder * Dietary Supplement * Serving Your Needs Since 1973 Siberian Eleuthero has been scientifically tested in Russia, then made famous by their athletes and astronauts to enhance energy and stamina. It is also widely used throughout Asia. A full spectrum extract has been done on these woody roots for maximum potency, absorption and assimilation. Guaranteed to contain a minimum 1.0% Eleutherosides B & E.