Least ingredients:
Potion of booze
Potion of water
Potion of carrot juice
Burb root
Pepper petal
Demon daisy

  Lesser ingredients:
Potion of healing
Potion of insight
Potion of troll blood
Potion of oil
Stomafillia herb
Curaria mancox herb

  Normal ingredients:
Potion of extra healing
Potion of invisibility
Potion of balance
Potion of cure poison
Potion of wonder
Potion of raw mana

  Greater ingredients:
Potion of strength
Potion of youth
Potion of longevity
Potion of ultra healing
Potion of cure corruption
Potion of boost speed

Potion of poison: least + lesser
Potion of insight: lesser + lesser
Potion of longevity: lesser + normal
Potion of youth: normal + greater
Potion of extra healing: normal + normal
Potion of cure poison: least + normal
Potion of blindness: least + least
Potion of deafness: least + least
Potion of booze: least + least
Potion of gain attributes: greater + greater

The two ingredients are never chosen to be the same item type.
A maximum of one herb per recipe is possible.
Potion of poison is always the first recipe for assassins.
Potion of gain attributes is always the last recipe.