A method for providing an increased expression of at least one of telomerase, brain-derived neurotrophic factor (BDNF), stromal cell-derived factor-1 (SDF1), CXC chemokine receptor 4 (CXCR4), and an immune regulatory factor of a stem cell in a subject is provided. The method comprises simultaneously or separately administering to the subject an effective amount of (a) a phthalide and (b) a stem cell.