Colostrum is milk. From Healthline - Bovine colostrum is made from the milky fluid a cow secretes after giving birth. It may help improve immunity, fight germs, and promote gut health. It appears safe for people, but more research is necessary. Colostrum is a breast fluid produced by humans, cows, and other mammals before breast milk is released. It’s very nutritious and contains high levels of antibodies, which are proteins that fight infections and bacteria. Colostrum promotes growth and health in infants and newborn animals, but research shows that taking bovine colostrum supplements may promote immunity, help fight infections, and improve gut health throughout life."
https://www.fda.gov/safety/recalls-market-withdrawals-safety-alerts/natures-energy-issues-allergy-alert-undeclared-milk-childrens-chewable-colostrum-products
Nature’s Energy Issues Allergy Alert on Undeclared Milk in Children’s Chewable Colostrum Products