The Evidence is quite overwhelming. The only sticking point still are the results so many people claim to experience following a series of flushes. Permanent elimination of skin conditions, allergies, fatigue etc. Is it possible that a placebo effect takes place that is so powerful that it reverses conditions?
What do you feel is taking place that has people feeling this positive effect?
These conditions have nothing to do with the gallbladder anyway. So even if they were getting stones out these symptoms would not change anyway.
But cleaning their system out due to the laxative effect of the oil, bile and magnesium sulfate could help a lot of these conditions. Consider how you feel and what your skin looks like when you are constipated long term.