Is there a way to speed up material production? 10 days and you can only make one at a time. I assumed when I got the assistant it would speed up, but no. It's one thing to grind and another to really just make me want to give up on that storyline.
Once you have the first two serums, you can dose the assistant to speed up production to 4 days, and 3 at a time. Honestly, I recommend using the backer code to get the first 2 serums, if not the full 5 for her. Then if you want all the content, save, pick the oral option on the second dose. Then save in a file or the like, and you can see that scene whenever. Then reload, and pick the other options for faster production and more materials at a time.
In other news, if you break your combat by going to the donate party members screen, but have nobody to donate (so it shows chosen as undefined), just pick yourself, and it should fix things. Found that one out the hard way. Thankfully I had a save a bit back, thought I had to go -way- back.
Another thing to note, the headbutt (spelling needs corrected in-game) states that it takes 5 stamina on the button, but only 1 in the chat log. It, however, does take away the full 5 stamina.