Clinically Studied Strains. Everyday Digestive Support. From the makers of VSL#3®, the #1 gastroenterologist-recommended multi-strain probiotics brand†, comes VSL4® Gut — a daily probiotic supplement designed to support digestive comfort, regularity, and overall gut wellness.* Supports healthy digestion and regularity with 8 probiotic strains known for gut health* Promotes microbiota diversity and helps maintain balanced gut flora for everyday wellness* Convenient, shelf-stable formula — precision-made for modern lifestyles, no refrigeration required