This group comprises both human - and animal insulins.
Insulin preparations are classified at 4 different 4th levels, according to onset and duration of action. Each 4th level is differentiated in 5th levels according to origin of insulin.
Products consisting of, e.g. beef and pork insulin, are classified as combinations (30-levels) at each 4th level according to onset and duration of action.

Combinations of fast acting insulins with intermediate-acting or long-acting insulins are classified in the 5th levels here.