Diminished Ovarian Reserve (DOR) refers to a reduction in the number of recruitable follicles in the ovaries and/or a decline in oocyte quality. Current research on its etiology and treatment remains unsatisfactory. This study will be conducted as a single-center, prospective, parallel, randomized, controlled clinical trial in DOR patients. Eligible subjects will be randomly assigned to three groups: LLLT (acupoint photodynamic therapy) + placebo (Dingkun Dan Simulant), LLLT (acupoint photodynamic therapy) + Chinese medicine (Dingkun Dan), and Chinese medicine (Dingkun Dan) alone. Clinical data and serum metabolomics will be assessed at baseline and after the 3-month treatment.