oceanclub: For heaven's sake, this is so annoying. Why does alchemy automatically use, without notifying you, quest items from part 1 that you can't get in part 3? I'm sorry but that's incredibly stupid. I find I don't have the pheronomes, I presumably used them at some point, and there's no way I'm reloading a save to go back 20 hours.
EDIT: Actually there's a mod here which allows you to buy that ingredient. Hurrah!
Note: If you've already started the quest, then read the comments for the mod carefully, as you have to delete the mod halfway through.
http://www.witchernexus.com/downloads/file.php?id=3 Quote: "If you were like me and accidentally wasted your Queen Endrega's Pheromones on a potion before act 3 due to poor game design and now cannot complete your quest for the best Steel Sword in the game.
Here's a fix to add
Queen Endrega's Pheromones x1
to Bras' items for sale, he's the npc that gives you the quest in the first place."
P.
Update to 1.2 The issues with the Alchemy/Potion loading has improved immensely. You should still be careful, though.