Press i, open alchemy tab (direct hotkey might be h or something) At the bottom of the window is a button to make all available extracts at once

I saw that button, but that’s not what I wanted to do, so I never used it.

You cannot use them until extracted. Not reason to not.

There was no apparent reason to extract them, because I had no potion recipe that could use them. That’s the point of this post.

I might be mistaken, but I think the recipes become available once you have the extract necessary. So if you extract all you should simultaneously unlock a bunch of new recipes. The extracts also go into the alchemy ingredient pouch, so it’s not that much clutter either.