Hypurin Vet Neutral is a beef-based short-acting insulin made by CP Pharma, which has had nothing added to change its speed or length of activity. 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 Neutral. Another comparable veterinary insulin (also UK only) is Insuvet Neutral. It is also equivalent to the former Lilly insulin, Iletin I R