After you’ve mixed a few ingredients together and created a potion, that potion could appear in a book listing the ingredients used and what the resulting potion was.
I think this could be a good idea as you may have created a good potion and want to remember what ingredients were used to make it. You could then just select the named potion and as long as you have the ingredients it will automatically make it for you. If you don’t have the ingredients then it could tell you what you are missing. This I think would improve the speed of alchemy.
Alternatively; the book could show you the quantity of each required ingredient that you currently have.
I think this would be good as when you are out exploring; you could look at the book to see what ingredients you need to be able to make this specific potion and you can then just keep an eye out for the remaining ingredients.
What do you think?