Colostrum 500 mg, 120 Capsules, NOW FoodsNOW Foods Colostrum Capsules Dietary Supplement. Healthy Immune Function. Naturally Occurring Immunoglobulins and Lactoferrin. Colostrum is the nourishing fluid produced by mammals as food for the newborn in the few days after birth, before milk production begins. This bovine derived food supplement offers a variety of biologically active proteins, including Immunoglobulins, Lactoferrin, and other factors that support the maintenance of lean muscle