Colostrum-IgG by Premier Research Labs is a premium-quality dietary supplement made from bovine colostrum. a nutrient-rich fluid produced by cows in the first few days after giving birth. This formula is a rich source of immunoglobulins (IgG). which are antibodies that help support healthy immune function. Colostrum-IgG is also a source of growth factors. which can help support tissue repair and regeneration. This supplement is an excellent choice for anyone looking to support their immune system and overall health and well-being.