Acidophilus/Bifidobacter/FOS is a combination of two bacteria and FOS (fructooligosaccharides), a naturally occurring indigestible sugar that maintains the growth of normal gut flora.* This product promotes healthy digestion, breakdown of food, a healthy environment in the intestines, and may also maintain normal vaginal flora.* This formula is dairy-free. The potency claims on Vital Nutrients’ Acidophilus/ Bifidobacter/FOS labels have been verified through the stability date. Due to the natural instability of probiotics, many companies publish only the CFU potency “present at the time of manufacture.” STORE REFRIGERATED.