The recipe for the chem "Tough Guy" I found requires something called a 'Healing Root'. I have beaten the game and explored far and wide and have not found any such items.
Do these actually exist in the game?
The only 'healing roots' I've found so far in my 60+ hours of play are the quest-specific ones on Slugbeast Isle, north-east of Goliat. They are, however, pre-faced as "mature" healing roots. In PB games, anything that is quest-specific tends to have such a pre-face (such as the 'deadly' slime drakon in the Edan converter). That leads me to believe that regular healing roots are supposed to exist, probably adjacent to water. It could be a bug. If I remember correctly, Gothic 3 had almost no mana plants to speak of in a very early launch version, and was fixed later. Could be a similar issue.