Swanson ® L-Proline is a food supplement designed to supplement the daily diet of adults, including physically active people and athletes. The formula contains L-proline encapsulated in gelatin capsules suitable for daily use. What is proline? Proline is an organic chemical compound from the α-amino acid group. L-proline is a natural amino acid included in plant and animal proteins. The richest dietary source of proline may be animal products, including those containing gelatin and cheese, beef, pork, and soy protein. A food supplement from Swanson ® can also be an excellent way to supplement the intake of L-proline in your daily diet. Each capsule contains 500 mg of proline with no added colors or preservatives. L-Proline 500 mg Muscle and Connective Tissue Health Swanson ® is just 1 proline gelatin capsule per day. A 100-pack will provide over three months of daily supplementation for anyone who needs an extra serving of protein amino acid in their diet.