A checklist to keep track of which potions you've found and brewed in The Witcher 3.
Suggested locations are not guaranteed to provide a given diagram, as diagram availability is randomised and they can be obtained from all sorts of random chests and merchants. The merchants and places that are suggested usually have the item, but not always.
Sources: https://thewitcher3.wiki.fextralife.com/Potions and http://gaminggix.com/featured/the-witcher-3-decoctions-list-and-where-to-find-the-monster-mutagens/
