Advanced Potion Making (Pathfinder Alternate Class Feature)
From D&D Wiki
Advanced Potion Making
Class: Alchemist, Witch
Requirements: An Alchemist may take this as a Discovery at level 10 or higher. A Witch with the Cauldron Hex may take this as a Major Hex.
Description: A Witch with this Hex or Alchemist with this Discovery may make potions of level 4-6 spells.