Natures First Immune Defense. With 25% IgG Antibodies Guaranteed. Symbiotics Colostrum Plus supports a healthy immune response and normal GI tract health. It is a Gluten Free Dietary Supplement featuring key natural Immune Factors. Quality and Purity Assured. Symbiotics Colostrum Plus features Immune Factors such as Immunoglobulins, which are types of proteins used by the immune system to identify and neutralize foreign objects, as well as Lactoferrin, a multifunctional protein, and Proline-Rich Polypeptides, which powerfully modulate the immune response. The Immune Factors found in Symbiotics Colostrum Plus have a dual action effect, working systemically throughout the body, as well as in the GI tract by maintaining healthy intestinal flora in a normal GI tract. Under the Symbiotics label, minimum levels of these important Immune Factors are verified by laboratory testing. Our colostrum is sourced exclusively from the first milking of cows not treated with rBST at USDA Grade A Dairies. All colostrum is laboratory tested and verified free from pesticides and antibiotics.