The present invention provides a method and a composition for suppressing the decomposition of codistin in vivo by adding Naringin, which is a natural substance with a weak toxicity to codistin contained in cordycepin or millitary cordyceps, as an ADA inhibitor, Functional food composition and a pharmaceutical composition in which the duration of potency is increased by inhibiting the decomposition of cordycepin or millitaryl Cordyceps codicifine.
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