Colostrum only comes from the first milking post-calving. It contains very high levels of many different vitamins, minerals, and can help boost immune health. Double Wood's Bovine Colostrum is standardized to contain 15% IgG (Immunoglobulins) and the Bovine used are grass fed. Each bottle contains 120 capsules of 500mg (60 servings of 1,000mg) and the product is encapsulated and tested in the USA from globally sourced materials. It also contains no fillers, is Non-GMO, and Gluten Free