I am assuming that your friend has had a gallbladder function test and that it contracts at 25% of the expected amount, hence 3/4 dead. This condition, called gallbladder stasis if often associated with biliary stasis. The biliary system can be severely congested and the gallbladder may be populated with sludge and soft cholesterol stones. Liver Flushing regularly has the potential to revive the biliary system and restore the function of the gallbladder.
In association with other life changes because there must be something causing the problems, a clean set of organs, being free of parasites and making some life changes can have a beneficial effect, and has the inherent capability to reduce or cure symptoms.