The present invention provides a novel agent/composition using a bioregulatory function of a food ingredient. Namely, it is intended to provide an allergy suppressive agent comprising chrysin, more specifically speaking, a histamine release inhibitory agent comprising chrysin; a composition comprising chrysin that is a composition for treating a disease or condition relating to the production of IgE; a composition comprising chrysin that is a composition for treating a disease or condition relating to a high-affinity IgE receptor; and a composition comprising chrysin that is a composition for treating a disease or condition relating to the overproduction of IL-4. It is preferable that the allergy suppressive agent and histamine release inhibitory agent according to the present invention further comprise apigenin.