SBI Protect Provides Concentrated Immunoglobulins to Enhance Mucosal Immunity. It is the only purified, dairy-free source of immunoglobulin G (IgG) available as a dietary supplement. Pure IgG works to maintain a healthy intestinal immune system by binding a broad range of microbes and toxins within the gut lumen. It helps protect microbial balance, aids GI barrier health and integrity and maintains normal inflammatory balance.