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According to wikipedia, though it doesn't seem to do as much with what herbalists claim it does, heal-all (Prunella vulgaris) does some stuff. "In vitro studies have shown it to have an antibacterial...

Unfortunately, most of them are laxatives, and while they work VERY effectively (cascara, from which exlax is made, and called "the kybo rocket" by my old scout troop) that's not as exciting as...