Colostrum is a highly-concentrated source of immune and growth factors produced from mammary glands shortly after giving birth. Pure Encapsulations Colostrum is derived from BSE, hormone, and pesticide-free USDA-certified dairy farms in the U.S. It is collected after the first 24 hours, defatted and standardized to contain 40% IgG. Colostrum contains immunoglobulins G (IgG), A (IgA), E (IgE), D (IgD), and M (IgM). Each has a specific role in immune health. IgG is naturally found in the highest concentration. Other naturally occurring immune support compounds include lactoferrin, proline-rich polypeptide (PRP), lymphokines, interferons, interleukins, oligosaccharides, lysozymes, and transforming growth factors (TGF-A and TGF-B).* – Unique Blend: Blend of immune supportive compounds.* – Cellular Immunity: Potential to help activate and balance immune response and immune cell function.* – Concentrated Substance: Shortly after they give birth cows (as well as humans) release colostrum from their mammary glands. Colostrum is a highly-concentrated substance containing immune and growth factors. – Pure Quality: Our supplements are made with only premium ingredients sourced from trusted suppliers and guided by our nutritional experts, then carefully manufactured and tested to verify their potency and purity. – Pure Difference: What makes us different isnt just our process or what goes into our supplements – what we leave out matters, too. Pure Encapsulations products are free from wheat, eggs, tree nuts & peanuts, gluten, artificial colors, flavors & sweeteners, coatings and shellacs, GMOs, and unnecessary binders, fillers & preservatives.