Sasang constitutional medicine is a Korean traditional medicine in which individuals are classified into four constitutional types, Taeyangin, Taeumin, Soyangin, and Soeumin. To develop new functional Saengsik products, we investigated the immunostimulatory activities of raw materials of Saengsik (milled rice, barley, Job's tears, soybean, adzuki bean, millet, eggplants, radish, carrot, Lentinus edodes, Agaricus bisporus, and Auricularia auricula-judae) and Saengsik products (Mix 1~6) in primary immune cells (lymphocytes and macrophages) isolated from blood of Taeumin, Soyangin, and Soeumin types. Increased cell proliferation as well as NO and TNF-${\alpha}$ protein production by immune cells treated with extracts of materials of Saengsik and Saengsik products were measured as immunostimulatory parameters. We chose milled rice, adzuki bean, radish, and Lentinus edodes to study the immunostimulatory activity of Teaumin, barley, soybean, eggplants, and Agaricus bisporus to study the immunostimulatory activity of Soyangin, as well as Job's tears, adzuki bean, carrot, and Auricularia auricula-judae to study the immunostimulatory activity of Soeumin. The mixtures (Mix 1~6) were made with different kinds and ratios of Saengsik materials based on the immunostimulatory activities of Saengsik materials. The immunostimulatory activity of Taeumin was highest in Mix 2 (rice 60%, adzuki bean 20%, radish 10%, and Lentinus edodes 10%) extract-treated immune cells among all six mixtures. The immunostimulatory activity of Soyangin responded best to Mix 4 (barley 60%, soybean 20%, eggplants 10%, and Agaricus bisporus 10%) among the six extracts (Mix 1~6). The increased immunostimulatory activity of Mix 6 (Job's tears 60%, adzuki bean 20%, carrot 10%, and Auricularia auricula-judae 10%)-treated immune cells was higher than the other five extracts (Mix 1~5). Accordingly, Mix 2, Mix 4, and Mix 6 may be useful as mixtures for Saengsik products having personalized immunostimulatory activities.