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28 mg/dL, 95% CI -0.45 to -0.11 mg/dL, P=0.001), and very low-density lipoprotein cholesterol (VLDL-C) (SMD -0.54 mg/dL, 95% CI -0.74 to -0.35 mg/dL, P0.00001), but no effect on high-density lipoprotein cholesterol (HDL-C) (SMD 0.01 mg/dL, 95% CI -0.16 to 0.18 mg/dL, P=0.89) was found. Subgroup analyses showed that the dosage of vitamin D used, the duration of intervention and the type of vitamin D supplementation (alone or with co-supplementation) might influence the effect of vitamin D on the lipid profile. This meta-analysis demonstrated that PCOS pa