Cytolog® is extracted from bovine colostrum, and contains a multitude of colostrum fractions, especially proline-rich-peptides, which are cytokine precursors. The colostrum used to make Cytolog® is antibiotic free, from USDA Grade A dairies located in the Southwest United States. Only the first and second milkings after calving are utilized, and only low heat flash pasteurization and low heat indirect drying are used. Cytolog® does not contain the larger milk proteins, and only about 3% lactose. Every batch of Cytolog® is tested to be free of antibiotics, bacteria, heavy metals and other contaminants.