HealthAid Sibergin contains highly concentrated Siberian Eleuthero root extract, matured to contain optimum levels of eleutherosides, which are believed to help sustain energy levels*. Eleutherosides in Siberian Eleuthero are believed to offer a steadier- and more natural- release of energy*. Siberian Eleuthero was traditionally used to prevent colds* and flu* and to increase energy* longevity and vitality*. It is widely used as an adaptogen. An Adaptogen is a substance that helps the body cope better with either mental or physical stress*. Siberian Eleuthero is also known to help improve athletic performance* and increase muscle strength.