Ractopamine /KLH is an antigen-adjuvant conjugate of Ractopamine and Keyhole Limpet Hemocyanin (KLH). By conjugating the antigen with a protein adjuvant , the production of antigen-specific antibodies in vaccine models can be enhanced. The conjugate does not affect protein folding or disrupt major epitopes, and it can enhance cross-presentation and the production of antigen-specific T cells.