Proline is an amino acid that plays a crucial role in the synthesis of proteins. Unlike most amino acids, it is classified as a non-essential amino acid, meaning the body can produce it on its own. Proline is important for maintaining the structure of proteins, particularly in collagen, which is vital for skin, cartilage, and connective tissues. In addition to its structural role, proline is involved in various metabolic processes. It can be converted into other amino acids and is essential for the production of energy. Foods rich in proline include meat, dairy products, and gelatin, making it accessible through a balanced diet.