I found a potion of exchange, and was considering using it to swap my stats. I have access to herbs to retrain dexterity, willpower, or toughness if needed. I looked up the mechanics on the wiki, and saw it said that drinking the potion will change the stat and its potentil. Let's just consider the example of my highest and lowest stats getting exchanged.

Toughness: base = 25, potential max = 38
Charisma: base = 6, potential max = 9

If I drink this potion, and end up with 6 toughness, would the potential also drop to 9, or stay at 38? I have a few potentials that are less than 25: if I won't be able to retrain toughness or willpower after drinking it, I'll probably save it for an item exchange. [or to get a cat out of my way]