1. Insulin: A hormone produced by the pancreas that regulates blood sugar levels. It helps cells absorb glucose from the bloodstream for energy.
2. Collagen: A structural protein found in connective tissues like skin, bones, tendons, and ligaments. It provides strength and elasticity.
3. Hemoglobin: Found in red blood cells, hemoglobin transports oxygen from the lungs to the rest of the body.
4. Antibodies: Proteins produced by the immune system that help defend the body against infections by binding to and neutralizing pathogens.
5. Enzymes: A large category of proteins that catalyze (speed up) biochemical reactions in the body. For example, lactase breaks down lactose (milk sugar).
