If I look at the successful recovery stories, then the root cause of all PFS symptoms seems to be in the gut. It could be that finasteride has severely damaged the intestinal mucosa (gut lining). This is also called as Leaky Gut Syndrome. Unfortunately, this is very hard to detect for specialist doctors.
In order for the intestinal mucosa to heal, the entire digestive tract must first calm down.
This would mean that fasting or consuming as little food as possible would be most successful in the long term. In addition, the diet should be based on an AIP diet. A carnivore diet or a paleo diet is basically a AIP diet. This also make sense why supplements are not very useful for the healing.