http://news.yahoo.com/news?tmpl=story&u=/ap/20041203/ap_on_sc/reversing_paralysis

"INDIANAPOLIS - Dogs with paralyzed hind legs regained the ability to walk after getting a shot of a chemical cousin of antifreeze that helped repair nerve cells in their damaged spinal cords, scientists reported."

Just a little bit too late for Superman. Perhaps it will be able to prevent another such.