From the Manufacturer:
Beneficial bacteria can be depleted by low-fiber diets, high meat diets, antibiotic use, travel and stress. Jarrow Formulas Prebiotics XOS + GOS primarily supports the growth of Bifidobacteria but also Lactobacilli for intestinal and immune function.** PreticX™ (Xylooligosaccharides) has been shown in clinical studies to promote the growth of Bifidobacteria.** GOS (Galactooligosaccharides) are the principal type of prebiotics found in human milk.
Manufactured by Jarrow