I often tend to make the mistake of assuming that natural = wimpy.
Then I remind myself: marijuana, peyote, opium, cocaine, all natural, none wimpy.
Case in point: Smooth Move tea from Traditional Medicinals made with senna. You can probably surmise it's purpose.
Do not drink two cups of this tea. Even 12 hours apart. Just trust me- one cup will do your body good. 2 and you will be indisposed for a while.