Colust tablet contains cow colostrum.What is cow colostrum ?Also called bovine colostrum,is a milky fluid that comes from the breasts of cows the first few days after giving birth, before true milk appears. It contains specific kinds of proteins called antibodies that fight disease-causing agents such as bacteria and viruses.Colostrum is rich source of antibodies such as IgG & IgM.Low IgG & IgM level in body compromises immunity that causes children to get sick faster and for longer period of timeEach pack of COLUST contains 30 delicious tablets.