Proline belongs to the so-called α-amino acids. Besides diet that provides proline, it is also synthesized in the body. Among the foods with the highest proline content are, first of all, gelatin, milk and dairy products as well as meat. Proline demand increases as the body ages.

One of the most important functions of proline is its participation in the synthesis of collagen. In addition, it is part of the extracellular matrix of connective tissue and is also found in joint cartilage. Hence its huge impact on the condition of skin, hair, and nails as well as the condition of the locomotor system. Proline is also credited with the ability to support the functioning of the immune system. Proline has also shown to improve the intestinal condition, and thus the absorption of nutrients from food.

Adding proline to the supplementation plan should be considered in case of problems with the osteoarticular system, joint pain, or deterioration of the skin's condition. Athletes who are particularly vulnerable to injuries in the musculoskeletal system may use them for prophylactic purposes. Proline accelerates wound healing and prevents the formation of scars, so it is worth reaching for in the period of convalescence after injuries associated with the breaking of tissue continuity.