All natural fiber supplement. Promotes regularity. Fiber, senna and purifying herbs. Fiber Plus is Yerba Prima's most powerful formula to restore and promote regularity. It contains all the benefits of fiber, plus the additional colon cleansing benefits of senna, in a base of purifying herbs (This statement has not been evaluated by the Food and Drug Administration. This product is not intended to diagnose, treat, cure, or prevent any disease).