L-proline is one of the 20 amino acids that are used to synthesize proteins by the human body. Functions of proline include helping form collagen, regenerating cartilage, forming connective tissue, repairing skin damage and wounds, healing the gut lining, and repairing joints.

^{1.L-Proline is used for biochemical research ,used for malnutrition, protein deficiency, gastrointestinal diseases, burns and postoperative protein supplements, etc.
2.L-Proline is a major component of collagen.
3.L-Proline as food additives, flavor agent, and the total heat generation amino sugar - carbonyl reaction, can generate special flavoring substances.
4.L-Proline is used for nutritional supplements.
5.L-Proline can improve plant cold tolerance}