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Each serving of these easy-to-swallow tablets contain 500 milligrams of immunoglobulin (IgG). Immunoglobulin, also known as antibodies, are essential proteins used by our bodies to defend against things which compromise a healthy immune system. ImmunAssure adds to the antibodies already present in a person?s digestive tract and is transferred throughout the entire body to fight for a strong immune system. Schiff ImmunAssure is a science-based, natural supplement with studies documenting the use of oral immunoglobulin (IgG) for immune support. The tablets also contain vitamin C, echinacea and andrographis for added immune support.