Dietary Supplement Cardiovascular Health Joint Support Collagen Formation Gluten-Free No Artificial Preservatives Potency & Quality Guaranteed An FDA Regulated FacilityCarlson - Providing the highest quality nutritional supplements since 1965.Pro-Rite combines free-form L-Lysine and L-Proline, essential components for healthy collagen formation. Collagen is a structural component that helps form the connective tissues for healthy ligaments, blood vessels, and bones.