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Provided is a preparation containing statin-encapsulated nanoparticles wherein statin is encapsulated within nanoparticles comprising a bioabsorbable polymer, said nanoparticles having a number-average particle diameter of less than 1000 nm and being to be used for enhancing the function of stem cells. Also provided is a stem cell with enhanced function, said stem cell containing the statin-encapsulated nanoparticles incorporated thereinto.