Yes! I love this one. Bald’s Eye-salve. I think it’s just the tip of the iceburg. For example, most medical historians and physicians will tell you that washing your hands before surgery, sterilizing instruments etc. was invented in the 19th Century (and the inventors were ridiculed and ostracized before it caught on). This is true, but PRIOR to the 19th Century, they did know this. Galen, Avicenna and Hyporcrites all said to wash hands before and after touching any wound, to boil instruments, to clean wounds with distilled vinegar, to use gold, silver and brass instruments where possible, etc. This was ditched in the 18th and early 19th Century because it was believed to be superstition! (which in a way it was, because they didn’t know about germ theory obviously).
I have personally seen at least a dozen kreuterbücher, German ‘cabbage books’ which include plant and herb drawings and descriptions of their properties as well as how to make medicines and drugs from them (lots of moonshining but how to make tinctures etc.) which are sitting in archives and have never been translated or even transcribed yet.
Incidentally I have Bald’s Eye-salve in the Codex rules. It’s in Codex Superno! Also in the market-tables in players guide and a couple of the adventure books.