Just a thought: the witches (yes, yes, roll your eyes, but do hear me out) know a good deal about medicinal plants.
What if we tested some of their potions to see if they truly do have medicinal properties?
I know you don't believe genuine MAGIC is involved for their potions to work, but that just means their potions work through CHEMISTRY. What have we got to lose?
We could do this as a sideline. It wouldn't have to compete with Joy per se -- it could just be another option.