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Journal of Endocrinological Investigation

, Volume 33, Issue 4, pp 234–238 | Cite as

The effect of vitamin D replacement therapy on insulin resistance and androgen levels in women with polycystic ovary syndrome

  • H. Selimoglu
  • C. Duran
  • S. Kiyici
  • C. Ersoy
  • M. Guclu
  • G. Ozkaya
  • E. Tuncel
  • E. Erturk
  • S. Imamoglu
Original Articles

Abstract

Insulin resistance (IR) is one of the common features of the polycystic ovary syndrome (PCOS), and recent studies indicate the possible role of vitamin D in the pathogenesis of IR and glucose metabolism. Aim of this study was aimed to determine the effect of vitamin D replacement therapy on glucose metabolism, insulin, and androgen levels in obese, insulin-resistant women with PCOS. Eleven women with PCOS were included in the study. Mean age of the patients was 23.6±5.7 yr, body mass index 33.9±5.1 kg/m2. Six patients (54.5%) had acantosis nigricans and 10 (90.9%) oligoamenorrhea. The mean Ferriman Gallwey score was 14.1 ±4.6. Only 2 women were within the normal limits of vitamin D levels as >20 ng/ml. Three weeks after the administration of the single dose of 300,000 units of vitamin D3 orally, 25-hydroxyvitamin D3 significantly increased from 16.9±16 ng/ml to 37.1 ±14.6 ng/ml (p: 0.027) and only 2 women were detected to have vitamin D3 levels <20 ng/ml. Although glucose and insulin levels were decreased non-significantly, homeostasis model assesment (HOMA)-IR significantly decreased from 4.41 ±1.38 to 3.67±1.48 (p: 0.043). No significant alterations were witnessed at the levels of DHEAS, total and free testosterone, androstenedione. No correlation was found between vitamin D with HOMA and other hormonal parameters. In conclusion, women with PCOS have mostly insufficient vitamin D levels, and vitamin D replacement therapy may have a benefical effect on IR in obese women with PCOS.

Key Words

Insulin resistance polycystic ovary syndrome vitamin D glucose metabolism androgen 

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Copyright information

© Italian Society of Endocrinology (SIE) 2010

Authors and Affiliations

  • H. Selimoglu
    • 1
  • C. Duran
    • 2
  • S. Kiyici
    • 3
  • C. Ersoy
    • 3
  • M. Guclu
    • 3
  • G. Ozkaya
    • 4
  • E. Tuncel
    • 3
  • E. Erturk
    • 3
  • S. Imamoglu
    • 3
  1. 1.Division of EndocrinologyMalatya State HospitalMalatya
  2. 2.Division of Endocrinology and Metabolism Meram YeniYolKonya Education and Research HospitalMeram-KonyaTurkey
  3. 3.Division of EndocrinologyBursaTurkey
  4. 4.Division of Biostatistic, Faculty of MedicineUludag UniversityBursaTurkey

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