Probiotic Advantage delivers 2 billion live bacteria to your large and small intestines to support your overall digestive health. The stomach is a harsh environment and oftentimes, probiotics have a difficult time making it through to your intestinal tract where they can be most effective. The patented BIO-tract delivery system slowly releases the probiotics along both your small and large intestines for all day support. This slow extended release keeps the delicate probiotic bacteria alive so they get to your intestines safely. Many probiotic supplements contain just one or two strains of bacteria but each easy- to-swallow Probiotic Advantage caplet gives you seven extremely hardy, live Lactobacillus and Bifidobacteria probiotic strains that are guaranteed at expiration. Plus, you get prebiotics to help feed and nourish these good bacteria. The prebiotics "supercharge" the probiotics, so the good bacteria crowd out the bad bacteria. Probiotics have always been a part of Dr. Williams' core recommendations because they play such an important role in your overall good health. You'll feel the difference with just one tiny caplet a day.