The present invention relates to a hot water extract of eight herb plants, which are fresh Rehmanniae Radix roots, white poria roots, white honey (honey), Lycium barbarum fruits, Cornus officinalis fruits, Schisandra chinensis fruits, and white Pleuropterus multiflorus roots. More specifically, the present invention has an excellent effect of being usable as a functional health supplement food composition, containing a concentrate of a hot water extract of eight herb plants, which are effective in the enhancement of immune activity or in the prevention and alleviation of dementia.
