Ractopamine/KLH is an antigen-adjuvant conjugate formed by combining Ractopaminewith keyhole limpet hemocyanin (KLH). This conjugation enhances the production of antigen-specific antibodies in vaccine models by linking the antigen with a protein adjuvant. The conjugate does not interfere with protein folding or alter major epitopes, while promoting cross-presentation and the generation of antigen-specific T cells.