Lactoferrin is a protein found in milk and is found in especially high levels in colostrum – the first milk which is produced right after a baby is born. Lactoferrin is also found in many bodily fluids including those found in the eyes, nose, and respiratory tract. Lactoferrin is a popular supplement due to its function as an antioxidant and its ability to support a healthy immune system as well as its ability to support tissue health as one ages.