Healer's Guild
From Wookieepedia, the Star Wars wiki.
The Healer's Guild was a mysterious organization from the days of the Old Republic that composed of healers from planets and species across the Galaxy. They possessed medicines and techniques not known to anyone else; one such was a universal cure that was made with carsunum spice.
The Guild was still in existence as of 45 BBY, but had disappeared by the time the Galactic Empire arose to replace the Republic.
