Cited by 88Selenium in Biological SystemsThyroid Disorders and TreatmentsOrganoselenium and organotellurium chemistry

Does selenium supplementation affect thyroid function? Results from a randomized, controlled, double-blinded trial in a Danish population

Winther, Kristian Hillert, Bonnema, Steen Joop, Cold, Frederik, Debrabant, Birgit, Nybo, Mads, Cold, Søren, Hegedüs, Laszlo·2015·European Journal of Endocrinology

Abstract

Objective: Selenium is present in the active site of proteins important for thyroid hormone synthesis and metabolism. The objective of this study is to investigate the effect of selenium supplementation in different doses on thyroid function, under conditions of suboptimal dietary selenium intake. Design: The Danish PREvention of Cancer by Intervention with SElenium pilot study (DK-PRECISE) is a randomized, double-blinded, placebo-controlled trial. A total of 491 males and females aged 60–74 years were randomized to 100 μg ( n =124), 200 μg ( n =122), or 300 μg ( n =119) selenium-enriched yeast or matching yeast-based placebo tablets ( n =126). A total of 361 participants, equally distributed across treatment groups, completed the 5-year intervention period. Methods: Plasma samples were analyzed for selenium and serum samples for TSH, free triiodothyronine (FT 3 ), and free thyroxine (FT 4 ) at baseline, and after 6 months, and 5 years of supplementation. Results: Plasma selenium concentrations increased significantly and dose-dependently in treatment groups receiving selenium ( P <0.001). Serum TSH and FT 4 concentrations decreased significantly and dose-dependently by 0.066 mIU/l ( P =0.010) and 0.11 pmol/l ( P =0.015), respectively, per 100 μg/day increase, with insignificant differences between 6 months and 5 years. No significant effects were found for FT 3 and FT 3 :FT 4 ratio. Conclusions: In euthyroid subjects, selenium supplementation minutely and dose-dependently affects thyroid function, when compared with placebo, by decreasing serum TSH and FT 4 concentrations. Based on these findings, selenium supplementation is not warranted under conditions of marginal selenium deficiency. However, a role for selenium supplementation in the treatment of autoimmune thyroid diseases is still unresolved.

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Crossref · 10.1530/eje-15-0069

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Authors
Winther, K. H., Bonnema, S. J., Cold, F., Debrabant, B., Nybo, M., Cold, S., & Hegedüs, L.
Affiliations
University of Southern Denmark (DK)
Corresponding author
Winther, Kristian Hillert
Venue
European Journal of Endocrinology
Published
2015-06
Volume
172
Issue
6
Pages
657-667
ISSN
  • 0804-4643 (ISSN-L)
  • 1479-683X
OpenAlex
W2150914299
Cited by
88
References
48
Citations by year
2026: 6 · 2025: 7 · 2024: 8 · 2023: 7 · 2022: 9 · 2021: 7 · 2020: 11 · 2019: 5 · 2018: 11 · 2017: 7 · 2016: 5 · 2015: 5
FWCI
8.98
Type
journal article
Language
en
Open access
closed
Locations
  • European Journal of Endocrinology (publishedVersion)
  • PubMed (publishedVersion)
  • University of Southern Denmark Research Portal (University of Southern Denmark) (submittedVersion)
Topics
  • Health Sciences › Nursing › Nutrition and Dietetics › Selenium in Biological Systems
  • Health Sciences › Medicine › Endocrinology, Diabetes and Metabolism › Thyroid Disorders and Treatments
  • Life Sciences › Pharmacology, Toxicology and Pharmaceutics › Toxicology › Organoselenium and organotellurium chemistry
Keywords
selenium supplementation, thyroid function, selenium deficiency, thyroid-stimulating hormone, free thyroxine, free triiodothyronine, dose-response relationship, selenium yeast, older adults, autoimmune thyroid disease, thyroid hormone metabolism
MeSH terms
Aged, Denmark, Dose-Response Relationship, Drug, Double-Blind Method, Female, Humans, Male, Middle Aged, Selenium, Thyroid Function Tests, Thyrotropin, Thyroxine, Time Factors, Trace Elements, Triiodothyronine, Yeast, Dried, Dietary Supplements

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