Pure Serum Defense CapsulesCompare to SBI Protect Capsules by OrthoMolecular Pure Serum Defense Capsules are the only purified, dairy free source of immunoglobulin G (IgG) available as a dietary supplement. Pure IgG helps to maintain a healthy intestinal immune system by binding a broad ranges of microbes and toxins within the gut lumen. CLINICAL APPLICATIONS Provides Concentrated Immunoglobulins to Enhance Mucosal Immunity Helps Maintain Microbial Balance Supports GI Barrier