NOW Super Colostrum combines Colostrum with the herbal ingredients, Larch Arabinogalactan, Olive Leaf and Astragalus to provide healthy immune system support. Colostrum is a natural source of immunoglobulins IgG, IgM and IgA, which are important immunological proteins for both animals and humans. In addition, NOW has also included Eleuthero to support a healthy stress response.