Thorne Pepti-Guard - 120 Capsules | Thorne Get natural digestive system support to promote a healthy stomach lining and soothe the GI tract. Tired of gastrointestinal upset? Thorne's Pepti-Guard is formulated to specifically support microbiota in the upper gastrointestinal (GI) tract, particularly in the stomach. The formula contains deglycyrrhizinated licorice (DGL) and organic aloe vera for their GI-healing properties, while Berberine HCI and bismuth citrate promote a healthy microbial balance. Pepti-Guard is best used in an 8-week protocol with two capsules, twice a day, between meals.