Thanks for this informative link, Colm.
I have been following the developments in the field of probiotics, for some years now, and it is very promising. Some studies on "psychobiotics" strains, aiming at improving mood and emotional stability, are already under way.
I am convince that probably almost any POIS sufferers would benefit from taking some quality probiotics supplements from time to time.
I think that fecal transplants are still not known enough to be totally safe, currently, but supplementing a single strains or a group of strains, that have been studied and are isolated in a supplement, is a very safe approach.