Siberian Eleuthero Root Extract Powder from Imperial Elixir delivers 500 mg of this traditional herb. Siberian Eleuthero has been scientifically tested and is used by Russian athletes and astronauts to enhance energy and stamina. It is also widely used throughout Asia. A full spectrum extract for maximum potency, absorption and assimilation. Guaranteed to deliver a minimum 1.0% Eleutherosides B & E.