According to this study, kudzu is able to increase the biosynthesis of allopregnanolone as well as progesterone.
https://www.nature.com/articles/s41598-017-06552-x
Not only that, but kudzu is also a potent gabaa receptor antagonist as well. Just from reading the study that I linked above, it sounds like kudzu is basically a very powerful anti-PFS herb if such thing actually existed. That was my impression anyways. Unfortunately I was unable to find any other studies that backed up this data, it seems like kudzu is a substance that isnt really very well researched outside of a handful of studies about its effect on alcoholism.
Whats really interesting about the fact that kudzu is used to treat alcoholism is that finasteride has a well known link with how people react (or dont react for that matter) to alcohol. This suggests that both kudzu and finasteride work on the same gaba receptors. I also want to point out that while I was researching kudzu I read that kudzu inclines people to not want to drink alcohol for weeks after they have stopped taking kudzu. The fact that the effects of kudzu can potentially last that long strongly suggests that kudzu may have some kind of profound effect on the mind, if kudzu’s effect is that powerful then maybe it is also powerful enough to reverse the effects of finasteride as well.
Personally I suspect that the problem with the gaba system as it relates to PFS is multifaceted and can differ from person to person in much the same way that PFS sufferers have complex and unique problems with their androgen functioning. That is to say, I think that some people have a problem with gaba deficiency, while others have a problem with the gaba receptor being desensitized, while others have a problem with gephyrin malfunction/deficiency, and then some (all?) of us have problems with all three to varying degrees. Therefore it might make sense to combine herbs that affect the gaba system in different ways and see how that affects us. Hypothetically I think that kudzu and DHM could be a potent combination worth trying out. I have some kudzu that I ordered the other day laying around, so I plan on experimenting with different combinations fairly soon to see what happens.