Highly Concentrated 12%** PRPs 22%** IgG A Dietary Supplement Our highly concentrated, first-milking Colostrum is produced using a proprietary process and is standardized to provide naturally occurring IgG, PRPs (Proline-Rich Polypeptides) and Lactoferrin. 12%** PRPs (Proline-Rich Polypeptides) - Considered to be Colostrum"s most important fraction. 22%** IgG (Immunoglobulins G1 & G2) 0.6%** Lactoferrin Our premium Colostrum is sourced year-round, from USDA Grade A dairy cows raised in the Southwestern United States. It is laboratory tested to ensure it is antibiotic and rBST free. It is low-heat processed in a state-of-the-art facility, allowing us to provide you with the highest quality Colostrum at an exceptional value! **The standardized Colostrum fraction percentage claims (12% PRPs, 22% IgG & 0.6% Lactoferrin) are conservative averages, based on years of analytical results provided by our supplier. These levels may vary slightly from batch to batch, as Colostrum is a 100% naturally derived raw material.