Stefan Pilz1, Rima Obeid2, Verena Schwetz1, Christian Trummer1, Marlene Pandis1, Elisabeth Lerchbaum1, Thomas R Pieber1,3, Barbara Obermayer-Pietsch1,3, Manfred Wilhelm4, Andreas Hahn5, Christiane Schön6. 1. Department of Internal Medicine, Division of Endocrinology and Diabetology, Medical University of Graz, Graz, Austria. 2. Department of Clinical Chemistry, Saarland University Hospital, Homburg, Germany. 3. Center for Biomarker Research in Medicine, Graz, Austria. 4. Department of Mathematics, Natural and Economic Sciences, University of Applied Sciences Ulm, Ulm, Germany. 5. 5Institute of Food Science and Human Nutrition, Leibniz University of Hannover, Hannover, Germany. 6. BioTeSys GmbH, Esslingen, Germany.
Abstract
Context: 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. Objective: We investigated whether free 25(OH)D concentrations differ according to use of HC. Design: This is a post hoc analysis of a randomized open trial. Setting: This study was conducted from 13 January to 9 May, 2016, at a clinical research organization in Esslingen, Germany. Participants: We included 201 apparently healthy women of childbearing age. Intervention: 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. Main Outcome Measures: Primary outcome was the difference in free 25(OH)D between users and nonusers of HC. Results: 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. Conclusions: 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.
RCT Entities:
Context: 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. Objective: We investigated whether free 25(OH)D concentrations differ according to use of HC. Design: This is a post hoc analysis of a randomized open trial. Setting: This study was conducted from 13 January to 9 May, 2016, at a clinical research organization in Esslingen, Germany. Participants: We included 201 apparently healthy women of childbearing age. Intervention: 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. Main Outcome Measures: Primary outcome was the difference in free 25(OH)D between users and nonusers of HC. Results: 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. Conclusions: 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.
Authors: Stefan Pilz; Winfried März; Kevin D Cashman; Mairead E Kiely; Susan J Whiting; Michael F Holick; William B Grant; Pawel Pludowski; Mickael Hiligsmann; Christian Trummer; Verena Schwetz; Elisabeth Lerchbaum; Marlene Pandis; Andreas Tomaschitz; Martin R Grübler; Martin Gaksch; Nicolas Verheyen; Bruce W Hollis; Lars Rejnmark; Spyridon N Karras; Andreas Hahn; Heike A Bischoff-Ferrari; Jörg Reichrath; Rolf Jorde; Ibrahim Elmadfa; Reinhold Vieth; Robert Scragg; Mona S Calvo; Natasja M van Schoor; Roger Bouillon; Paul Lips; Suvi T Itkonen; Adrian R Martineau; Christel Lamberg-Allardt; Armin Zittermann Journal: Front Endocrinol (Lausanne) Date: 2018-07-17 Impact factor: 5.555
Authors: Stefan Pilz; Armin Zittermann; Rima Obeid; Andreas Hahn; Pawel Pludowski; Christian Trummer; Elisabeth Lerchbaum; Faustino R Pérez-López; Spyridon N Karras; Winfried März Journal: Int J Environ Res Public Health Date: 2018-10-12 Impact factor: 3.390