Is does reasonable but I also think that it a subconscious delaying tactic.
These prep products have a very variable. Like all medicines they need to be the correct medicine for the condition and you metabolism. They all work for someone. There main aim is to increase the circulation or flow of bile and this has the ability to dissolve or reduce soft stones. However, about 90% hard stones are not effected by dissolvers; even prescription medication such as ursodial. Dissolving medication and herbs can be helpful in reducing the sludge that often accumulates with hard gallstones.
The dissolvers take about 2 weeks for maximum impact to act but often a week is adequate.