Health.com: 5 types of insulin and how they work 5 Types of Insulin and How They Work 5 Types of Insulin and How They Work 5 Types of Insulin and How They Work Health.com: 5 types of insulin and how they work 5 Types of Insulin and How They Work Health.com: 5 types of insulin and how they work 5 Types of Insulin and How They Work Health.com: 5 types of insulin and how they work 5 Types of Insulin and How They Work 5 Types of Insulin and How They Work 5 Types of Insulin and How They Work 5 Types of Insulin and How They Work