Dr. David Williams Probiotic Advantage SupplementProbiotic 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