You're referring to extreme government regulation making it prohibitively expensive to start up insulin providers that compete with the established government protected monopolies. Which is anything but Capitalism in action.

The same goes for healthcare in general. It's one of the most regulated sectors of the US economy and the government places an extreme cost on doing most anything in that sector through hyper regulation and very epic scale barriers to entry. The US is very far from being a Capitalist healthcare system, it's in fact the worst of both systems: it's a hyper regulated corporatist system, intentionally protected by the government from competition, captured by corporations.