One of the overlooked (or at least, seldom discussed) conventions of wuxia fiction were "superdrugs" capable of curing otherwise uncurable injuries and diseases that even modern medicine probably couldn't cope with. Famous examples of such superdrugs are the "Thousand Year Ginseng" and "Icy Mountain Snow Lotus."
So if you were to rank the great superdrugs of wuxia, what would they be?