Fiber, Senna And Purifying Herbs Fiber Plus is Yerba Primas 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. . Use As Needed, But Not Longer Than Two Months Everyday. For Long Term Regularity, Gradually Substitute Yerba Prima Daily Fiber Or Colon Care For Fiber Plus.