Hypurin Vet Protamine Zinc is a beef-based PZI insulin made by CP Pharma. It is approved only for veterinary use and for distribution within the UK -- from abroad you can only order the human-approved equivalent, Hypurin Bovine Protamine Zinc. Insuvet Protamine Zinc is also 100% bovine, U100 PZI. US-compounded BCP PZI and Summit's PZI U100 strength insulin is comparable to this one.