The present invention provides adjuvant compositions that are capable of modulating the immune response in a subject, including enhancing or suppressing the immune response. These adjuvant compositions may also be used to enhance or suppress the immunogenicity of antigens by enhancing or suppressing antigen-presentation activity, enhancing or suppressing innate immune responses through activation or suppression of, e.g., natural killer cells, and/or direct activation of subsets of B and/or T cells. Also provided are methods of making the adjuvant compositions as well as methods of using the adjuvant compositions. In certain embodiments, the compositions comprise combinations of the following: a pharmaceutically acceptable carrier, a flavonoid, a tannin and a vitamin. The compositions may further comprise an antigen.
