Not sure I’d risk this myself. However when I did chemistry at A level at school, with the intention of going into pharma for a bit, I did extract aspirin from willow bark. This is something you can do relatively easily and safely yourself. Disclaimer: if you kill yourself it wasn’t my fault.

Thanks to my wonderful chemistry teacher I got a couple of hours at Glaxo and run NMR on it to validate it. Was an amazing experience even if it was a bit worrying getting the train there with vials of white crystalline substance on me.