It DOESNT matter if senna is "natural" it is still a bowel stimulant and not good at all to use long term. The peristaltic muscles get used to the stimulants and then have a hard time functioning without it. I know from experience. Dr schulze must have a great team of reviewers on staff because there is not much info about this being habit forming online. And only glowing reviews on amazon. Heroin and cocaine come from natural plants too.