1) does anyone know the difference between XOS, FOS and GOS? specifically, which do you take to increase which gut bacteria XOS - PreticX (Xylooligosaccharides) has been shown in clinical studies to promote the growth of Bifidobacterium. GOS - (Galactooligosaccharides) are the principal type of prebiotics found in human milk. RELATED TO WHICH GUT BACTERIA? FOS - RELATED TO WHICH GUT BACTERIA? 2) Does anyone know which prebiotics map to which of these? for example, I'm currently taking aribinogalactan, so which of those do the galactans map to (GOS or FOS)?