Colostrum is milk from a cow in the first 3 days after delivery of a newborn. These first milkings contains immunoglobulins also known as antibodies to infectious agents to which the mother has been exposed. These maternal antibodies are then transferred to the newborn calf as a form of protection against disease. They are very essential in the first few days of life.
Colostrum has also been used by humans for its important IGF, Immune Growth Factors as well. These growth factors help increase the human immune system, and create natural antibodies to disease and illness. It has also been shown to increase energy and aid in digestion.