Unlike most drugs insulin is derived from animal cells so it’s not really possible to make a generic because you can’t demonstrate that your end product is iden

Unlike most drugs insulin is derived from animal cells so it’s not really possible to make a generic because you can’t demonstrate that your end product is identical to an existing product (at least not as far as the FDA is concerned). The formulations are constantly tweaked by manufacturers to evergreen the patents too. New patents allow the price to be pushed up without risking new competition arriving.