system
Given the following post, respond as if you're commenting on Reddit:
human
[The Boys] question on the compound V (spoilers Season 1)

Hi, I just finished season 1 of The Boys and it was awesome. 
I just want to make sure I understand the compound V thing:
The V compound is a secret compound used by Vought to create superheroes. They make NDA contracts with the parents so nobody knows about it, even the supers themselves.

In season 1, Homelander wants to create super terrorists. He steals some V and gives it to A-Train who will deliver it to terrorists including those who have Kimiko. By the way, A-Train will keep some of it for himself and his girlfriend and he will become addicted. 

In all of that, I try to understand: 

What do Homelander, Popclaw, A-Train or even Maeve know about the V compound? Is Homelander the only superhero who knows what V is really for? 
I think that this secret must be very hard to keep so I don't see how other superheroes could not know about it. Besides, I don't see how Homelander and A-Train can get V discreetly without Stilwell knowing about it.
gpt
It's pretty clear their is a small black market trade in compound V.  
Either someone who knew the production process set up an underground kitchen; some is stolen from Vought and resold, or, Vought itself is deliberately running a black market for reasons of it's own.