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Evidence suggests that vitamin D deficiency correlated with metabolic disorders in women with polycystic ovary syndrome (PCOS). We conducted this systematic review and meta-analysis to evaluate the impact of vitamin D supplementation alone on glucose, lipid, and androgen parameters and inflammation biomarkers in women with PCOS. Methods. Literature research was conducted in Pubmed, Embase, Web of Science, Clinical Trials, and Cochrane Library to identify relevant randomized controlled trials (RCTs) up to March 2020. The effect of vitamin D supplementation alone on women with PCOS was compared with administration of placebo. The systematic review and meta-analysis protocol was registered in the International Prospective Register of Systematic Reviews (Prospero) as number CRD42020157444. Results. Thirteen randomized controlled trials with 824 patients in total were included. Serum FPG, fasting insulin, HOMA-IR, and VLDL-C were significantly decreased in the vitamin D group versus placebo. Vitamin D supplementation group also showed a significantly elevated level of QUICKI. No significant impact was seen on serum triglyceride, total-C, LDL-C, HDL-C, total testosterone, DHEAS, SHBG, or hs-CRP. Subgroup analysis demonstrated that oral vitamin D intake had significantly decreased serum triglyceride and total-C level in women with PCOS who have vitamin D deficiency (serum vitamin D\u2009&lt;\u200920\u2009ng\/ml). Conclusion. The findings of the present meta-analysis indicate that vitamin D supplementation exerted favorable effects among women with PCOS on glucose metabolism and lipid metabolism, especially in vitamin D deficient women, but had no significant effect on the androgenic profile or inflammation status.<\/jats:p>","DOI":"10.1155\/2020\/7850816","type":"journal-article","created":{"date-parts":[[2020,12,23]],"date-time":"2020-12-23T15:35:58Z","timestamp":1608737758000},"page":"1-18","source":"Crossref","is-referenced-by-count":32,"title":["Vitamin D Supplementation Ameliorates Metabolic Dysfunction in Patients with PCOS: A SystematicReview of RCTs and Insight into the Underlying Mechanism"],"prefix":"10.1155","volume":"2020","author":[{"given":"Shan","family":"Guo","sequence":"first","affiliation":[{"name":"Department of Reproductive Medicine, Beijing Obstetrics and Gynecology Hospital, Capital Medical University, Beijing 100026, China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Reshef","family":"Tal","sequence":"additional","affiliation":[{"name":"Division of Reproductive Endocrinology and Infertility, Department of Obstetrics, Gynecology, and Reproductive Sciences, Yale University School of Medicine, New Haven, CT 06510, USA"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Haoyu","family":"Jiang","sequence":"additional","affiliation":[{"name":"Department of Neurosurgery, Beijing Tiantan Hospital, Capital Medical University, Beijing, China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Tao","family":"Yuan","sequence":"additional","affiliation":[{"name":"Department of Reproductive Medicine, Beijing Obstetrics and Gynecology Hospital, Capital Medical University, Beijing 100026, China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-8951-2648","authenticated-orcid":true,"given":"Ying","family":"Liu","sequence":"additional","affiliation":[{"name":"Department of Reproductive Medicine, Beijing Obstetrics and Gynecology Hospital, Capital Medical University, Beijing 100026, China"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"311","reference":[{"key":"1","doi-asserted-by":"publisher","DOI":"10.2217\/whe.15.13"},{"key":"2","doi-asserted-by":"publisher","DOI":"10.1210\/edrv.18.6.0318"},{"issue":"4","key":"3","first-page":"232","article-title":"Polycystic ovary syndrome: a major unrecognized cardiovascular risk factor in women","volume":"2","author":"C. 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