Improves Mental and Physical Vitality, Also Helps the Body Adapt To Stress Siberian Eleuthero extract is standardized to two actives: 0.3% eleutheroside B and 0.5% eleutheroside E to improve mental and physical vitality, as well as help the body adapt to stress. Athletes find Siberian Eleuthero useful daily exercise. Directions Take 1 capsule twice daily, preferably with food. Some sources suggest Eleuthero should be taken continuously for 6 to 8 weeks, followed by a 1 to 2 week break before resuming. Disclaimer These statements have not been evaluated by the FDA. These products are not intended to diagnose, treat, cure, or prevent any disease.