Highest Biological Activity Proline-Rich Polypeptides rBGH Free Lactose Reduce 35% Immunoglobulins Dietary Supplement Jarrow Formulas Colostrum Prime Life contains a minimum of 35% immunoglobulins, double the strength of typical colostrum products, because it comes from the first milking. Colostrum Prime Life is collected within 12 hours of calving from American, pasture-fed cows. The colostrum undergoes low-temperature processing along with testing to ensure that the difference colostrum immunoglobulin fractions retain their biological activity and are not denatured. Colostrum Prime Life also contains proline-rich polypeptides (PRPs), a special class of polypeptides shown to have immune modulation and gastrointestinal health-promoting properties. Colostrum Prime Life is also rich in lactoferrin, an important iron building glycoprotein found naturally in tears and saliva that supports immune function and promotes the growth of the good bacteria. Colostrum prime Life is free of hormone rBGH, antibiotics pesticides, and is F.D.A certified for sale in the USA.