This is the Book One Counterpart of this shop, are you looking for Reens' Potion Shop (Book 3)?
Reens potion shop is a shop located in Falconreach, but still haven't played a role in any saga, although you can train Heal Alchemy here.
- "Alchemy deals with changing one or more materials into something else entirely!" ―Reens
Alchemy is trained at Reens' Potion shop and Alina's Potion Shop.
For Alchemy working, you need to gather reagents in Reens's quests, after this you must "train alchemy", that actually is a combination game.
Threre are also some undead alchemists, that died trying to get the Magic Stone.