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Vitamin D supplementation and hemoglobin levels in hypertensive patients: a randomized controlled trial

Epidemiological evidence suggests that circulating 25-hydroxyvitamin D (25OHD) levels are inversely associated with hemoglobin (Hb) levels and anemia risk. We evaluated whether vitamin D supplementation improves Hb levels and reduces anemia risk in hypertensive patients. Two hundred patients with 25...

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Bibliographic Details
Main Authors: Ernst, Jana Barbara (Author) , März, Winfried (Author)
Format: Article (Journal)
Language:English
Published: 2016
In: International journal of endocrinology
Year: 2016, Volume: 2016
ISSN:1687-8345
DOI:undefined
Online Access:Verlag, Volltext: http://dx.doi.org/undefined
Verlag, Volltext: https://www.hindawi.com/journals/ije/2016/6836402/
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Author Notes:Jana B. Ernst, Andreas Tomaschitz, Martin R. Grübler, Martin Gaksch, Katharina Kienreich, Nicolas Verheyen, Winfried März, Stefan Pilz, and Armin Zittermann

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520 |a Epidemiological evidence suggests that circulating 25-hydroxyvitamin D (25OHD) levels are inversely associated with hemoglobin (Hb) levels and anemia risk. We evaluated whether vitamin D supplementation improves Hb levels and reduces anemia risk in hypertensive patients. Two hundred patients with 25OHD levels <75 nmol/L who attended the Styrian Vitamin D Hypertension Trial were included, of whom 188 completed the trial. Patients randomly received 2800 IU vitamin D3 daily or a matching placebo for eight weeks. Initially, the prevalence of anemic status (Hb levels <12.5 g/dL) and deficient 25OHD levels (<30 nmol/L) was 6.5% and 7.5%, respectively. All anemic patients had 25OHD levels >50 nmol/L. The mean (95% confidence interval) vitamin D effect on Hb levels was 0.04 (−0.14 to 0.22) g/dL (). Moreover, vitamin D treatment did not influence anemic status significantly (). Likewise, vitamin D had no significant effect on Hb levels in the subgroups of anemic patients or in patients with initial 25OHD levels <30 nmol/L. In conclusion, a daily vitamin D supplement of 2800 IU for eight weeks did not improve Hb levels or anemic status in hypertensive patients. Future trials should focus on anemic patients with deficient 25OHD levels (e.g., <30 nmol/L). This trial is registered with clinicaltrials.gov [NCT02136771]. 
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