Alchemy can be pretty powerful in the game, and there is a huge difference between the simple versions of potions, oils and bombs and the enhanced or superior versions. The superior versions are often much better than the first ones you can craft.
My main problem is that I'm still missing many recipies, especially annoying is missing the first one and being unable to craft the enhanced and superior versions due to that. I've been trying to buy all recipies I could find, but I'm certain that I haven't found everyone that sells alchemy recipies.
Who are the merchants that sell alchemy recipies, and where can I find them?