Beyond sugar, insulin helps your muscles absorb amino acids to build protein, making it a powerful "anabolic" or growth-promoting hormone. Fascinating Historical Milestones The journey of insulin is filled with "firsts" in science: The History of a Wonderful Thing We Call Insulin

Insulin's primary job is to manage your body's energy supply. Think of it as a key that unlocks your cells so they can absorb glucose (sugar) from your bloodstream for fuel.

When you have extra sugar, insulin tells your liver , muscles , and fat cells to store it for later use.