Proteins are used in medicine, cosmetics, and food because of their functional properties.

Therapeutic proteins:

• Insulin: For diabetes.
• Interferons: Treat viral infections, cancer.
• Growth hormones: Correct growth deficiencies.
• Monoclonal antibodies: Target cancer or autoimmune diseases.

Other uses:

• Cosmetics: Collagen, keratin for skin/hair care.
• Food industry: Enzymes in cheese, bread, beverages.
• Research: Enzymes and proteins in labs for experiments.

Proteins are versatile and help treat diseases, improve products, and support industrial processes.