Dark science-based fiction recs?

Hi hi! I’ve recently had this itch that I’m craving to be scratched in a book and I wouldn’t even know where to begin to start looking for what I want.

I really dig disturbing, immoral and macabre science. Not like sci-fi lasers and talking animals, but very in-depth even inhumane science experiments. Viruses, parasites, you name it. I like quite dark reads with characters that aren’t very good people. I’m big onto diving into the more sinister sides of humanity and all the undoing of people that comes with it. Other themes I love that could work with this idea is asylums, religion, cults, hospitals and what not.

I’m open to more emotional character studies or books with more of a proper storyline to them, either works! I’m super open to any suggestions even slightly similar, any help is hugely appreciated <3