It is hard to say if Shank Pushpi or Convolvulus Pluricaulis works or not as the manufacturer indicates. There isn't any evidence on that explains the testing that was done or those results. They do market this product to help with a variety of ailments and that is what draws people to it. Most people want a natural remedy to help them reduce water retention, digestion issues, and more.
Since diet and exercise of an individual also influence digestion, retaining water, constipation, and even anxiety as well as stress there are so many variables here. It is virtually impossible to know if credit should be given to this supplement for what is accomplished or not.