Problem to be solved. To produce equol simply and reliably. Solution. The method includes at least following steps in which: soybean embryo isoflavone containing daidzin or daidzein, Î² glucosidase, and "reduced mineral hydrogen powder with hydrogen carried on deep ocean water powder filtrated with an activated carbon filter and mineral-concentrated" are dissolved in water to prepare a hydrogen dissolved soybean embryo isoflavone solution; and under predetermined temperature and pressure conditions, the hydrogen dissolved soybean embryo isoflavone solution is mixed and let stand for a predetermined period of time.
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