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Muscle and Connective Tissue Health500 mg Per CapsuleDietary SupplementMaintains Muscle and Connective Tissue HealthEssential Component of CollagenHigh Quality Amino Acid SupplementScience-Backed Quality Since 1969Introducing our first economical high-quality L-proline supplement. An amino acid manufactured in the liver Swanson L-Proline serves as a precursor to hydroxyproline which is an essential component of collagen tissues that helps maintain their structural characteristics. L-Proline is involved in many processes that produce and maintain connective tissues.