A traditional Chinese herbal medicine derived from the plant Astragalus membranaceus with potential immunopotentiation activity. Jin Fu Kang may stimulate anti-tumor macrophage and natural killer cell activity and may enhance immune recognition of tumor cells by inhibiting the production of T-helper cell type 2 (Th2) cytokines such as interleukin-4 (IL-4) amd interleukin-10 (IL-10).