No Free Samples! Mod
After I got Realm of Magic, one feature that kind of annoyed me was the fact that anytime you learned a new potion recipe, you got a free sample of it. I think it just makes magic gameplay a little too easy. I honestly have no idea if a mod like this has been done before, but I can't find one so I made it myself (and also some help from Zero Mods)!
Basically, I had to change the tuning of every potion in the game so that you don't get a free sample after getting a new recipe from learning it, discovering it or being taught it by a sage. I also changed the in-game text that pops up to reflect this change by removing the part about obtaining a sample in your inventory.
In terms of compatibility with custom potions, you will still receive samples from custom potions unless the modders of each potion changes that. However, you will still always receive the same shortened pop-up unless the modder changed that for their mod. Also, this will probably conflict with any mod that messes with the loot tunings of any of the potions.