It’s forming dihydrofinasteride and than “covalently bonding” with the substrate that the enzyme needs to convert T-DHT. In other words it’s creating a permanent alteration of the substrate so that it can’t interact with the enzyme like it normally would.
The enzymes can regenerate but if they try to react with their substrate that’s bonded with
“dihydrofinasteride” this could still be a problem seeing that according to the source I posted above in order for the 5AR enzyme to convert T-DHT it needs its substrate.
I think the question you want to ask is does the substrate regenerate it self resulting in new substrate not covalently bonded with this dihydrofinasteride? Or does the dihydrofinasteride “stick around” and continue to bond to the new regenerated substrate? When you see people talking about Fin preventing it’s own metabolism I think this is what they are talking about. We would need a bio chemist to chime in haha …
Either way I don’t think Lack of 5ar, t or DHT is the problem so I don’t think we need to worry about it. It’s about making the T and DHT we still have work again.