Gut Restorative PRP is an all-natural supplement comprised of bovine colostrum for supporting a healthy immune system. Bovine colostrum is an abundant source of immunoglobulins, as well as live cells that secrete key proteins including cytokines, lactoferrin, and proline-rich polypeptides (PRP). Supplementing with bovine colostrum has been shown to bolster the lining of the gastrointestinal tract and fight inflammation.