I could also see with stuff like that. I'm not sure how to go about creating things though without creating a huge assembly line of shit.
In real life, there are few barriers to doing just that - in games, less so.
1. Cost of materials (cool) 2. Time (totally not cool - don't want players taking time off to make potions, same problem as 'paint parties') 3. Expertise (cool) 4. Stuff needed to do it with (over head and rare materials) Both of these are OK as it gives the PC's yet somewhere else to worry about and 'let's go hunt pixies to get their spleens for potions' but then you have the potential of a huge complicated list of shit - and what effects they would need have to be detailed.