Jarrow Formulas Colostrum Prime Life formula contains a minimum of 30% immunoglobulins, proteins that support immune and gastrointestinal health. Colostrum is collected within 16 hours of calving from American pasture-fed cows that have been raised without the use of growth hormone (rBGH), antibiotics or pesticides in their feed. Colostrum low-temperature processing, along with analytical testing, ensures that immunoglobulin fractions are not denatured. To further minimize the denaturation of immunoglobulins, Colostrum Prime Life is delivered in delayed release capsules.