Medizinische Universität Graz - Research portal
Selected Publication:
SHR Neuro Cancer Cardio Lipid Metab Microb
Pilz, S; Obeid, R; Schwetz, V; Trummer, C; Pandis, M; Lerchbaum, E; Pieber, TR; Obermayer-Pietsch, B; Wilhelm, M; Hahn, A; Schön, C.
Hormonal Contraceptive Use Is Associated With Higher Total but Unaltered Free 25-Hydroxyvitamin D Serum Concentrations.
J Clin Endocrinol Metab. 2018; 103(6):2385-2391
Doi: 10.1210/jc.2018-00336
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- Leading authors Med Uni Graz
- Pilz Stefan
- Co-authors Med Uni Graz
- Lerchbaum Elisabeth
- Obermayer-Pietsch Barbara
- Pandis Marlene
- Pieber Thomas
- Theiler-Schwetz Verena
- Trummer Christian
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- Abstract:
- Intake of hormonal contraceptives (HC) is associated with higher total 25-hydroxyvitamin D [25(OH)D] concentrations, but the effect of HC on free 25(OH)D is unclear. We investigated whether free 25(OH)D concentrations differ according to use of HC. This is a post hoc analysis of a randomized open trial. This study was conducted from 13 January to 9 May, 2016, at a clinical research organization in Esslingen, Germany. We included 201 apparently healthy women of childbearing age. Participants were randomly assigned to receive a daily multimicronutrient supplement for 8 weeks; the supplement contained 200 IU (n =100) or 800 IU (n = 101) of vitamin D3. Primary outcome was the difference in free 25(OH)D between users and nonusers of HC. Overall, 176 participants [median (25th to 75th percentiles) age: 25 (22 to 29) years] with available free 25(OH)D were included in the present analysis. At baseline, total 25(OH)D was significantly higher in users (n = 110) than in nonusers (n = 66) of HC [49.2 (33.4 to 63.4) vs 39.1 (23.8 to 52.5) nmol/L; P < 0.001], whereas there was no difference in free 25(OH)D [7.87 (6.50 to 10.11) vs 7.88 (6.35 to 10.12) pmol/L; P = 0.923]. These results were confirmed after multimicronutrient supplementation and in subgroups according to treatment allocation. Use of HC was associated with, on average, 26% higher total 25(OH)D, whereas free 25(OH)D values did not differ according to use of HC. These findings are relevant for epidemiological studies, but the physiological implications remain to be clarified.