Is insulin an enzyme or hormone? Insulin is not an enzyme. It is a hormone. While enzymes help speed up chemical reactions, hormones work like messengers. Insulin is the main anabolic hormone in the body. It helps store nutrients and controls how your body uses glucose (sugar). After you eat, your blood sugar rises. This triggers the pancreas to release insulin. Insulin helps muscle... https://www.freedomfromdiabetes.org/blog/post/insulin-is-an-enzyme-or-hormone/2786