The present invention relates to a group consisting of (a) D-psicose 3-epimerase, a strain expressing the enzyme or a culture of the strain, and (b) an aluminate and an iodate. A method for producing D-psicose from D-psicose comprising a composition for producing D-psicose comprising one or more selected salts and D-fructose comprising adding (b) to (a), or D- The present invention relates to a method for increasing the conversion rate from fructose to D-psicose. [Selection] Figure 1
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