What it is. BCP PZI is a bovine-origin PZI-based compounded insulin. Because it's beef based, its amino acid chain is almost the same as that of a cat, so it's especially well-matched to cats. BCP Veterinary Pharmacy in Houston, TX, USA, manufactures and is the sole source supplier for BCP PZI. BCP PZI is commonly used in diabetic cats in the U.S. Like other insulins, BCP PZI is normally administered twice a day. Shelf life: 6 months. Handling: You should refrigerate BCP PZI when it is not in use. If you happen to leave it out for one night, most report no problems.