T3/BSA is a conjugate of T3 (thyroxine) with bovine serum albumin (BSA), functioning as an antigen-adjuvant complex. By conjugating the antigen with the protein adjuvant, the production of antigen-specific antibodies in vaccine models is enhanced. The conjugate does not affect protein folding or disrupt primary epitopes, and it can enhance cross-presentation and the generation of antigen-specific T cells.