Ingun's Alchemy Chest is a reward for completing Ingun's Task given by Ingun. She will give you Ingun's Supply Chest Key and, as long as you have the key on you, you will gain access to the chest. It is located inside backroom of Elgrim's Elixirs, an alchemy shop in Riften. The chest spawns Alchemy ingredients and Potions every 1-2 days
Random potions and ingredients will be placed inside chest by Ingun every 24h/48h. Must leave shop for replacement.