Colostrum

The first “milk” produced late in pregnancy and the first few days after birth.  Colostrum is especially high in growth factors and  immunoglobulins – which are beneficial for the newborn. 

Colostrum from immunized cows has been used experimentally to treat gastrointestinal infections. More generally, colostrum is used as a supplement to enhance general immunity, health and athletic performance.  Although probably useless as a performance enhancer, there’s some data to support its use for general health/wellness, although studies have used amounts much larger than many supplements provide.