USDA Certified Colostrum Capsules. Free From Antibiotics & Added Hormones. 35% Immunoglobulins. Collected Within 16 Hours of Calving. Spray-Dried with Low Pressure and Temperatures. For retention of biological activity. Jarrow Formulas Colostrum Prime Life contains a minimum of 35% immunoglobulins, and is collected within 16 hours of calving from American, pasture-fed cows. The colostrum undergoes low-temperature processing along with testing to ensure that the different 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-modulating and gastrointestinal health-promoting properties. The lactoferrin contained in Colostrum Prime Life is an important iron-binding glycoprotein found naturally in the body that supports immune function and promotes the growth of the good bacteria. Colostrum Prime Life is from cows raised without the use of growth hormone (rBGH), antibiotics or pesticides in their feed.