• Jadwiga Kryczyk-Kozioł, Paweł Zagrodzki, Ewelina Prochownik, Anna Błażewska-Gruszczyk, Marian Słowiaczek, Qian Sun, Lutz Schomburg, Ewa Ochab, and Mirosław Bartyzel.
• Department of Food Chemistry and Nutrition, Jagiellonian University Medical College, Kraków, Poland.
• Int. J. Clin. Pract. 2021 Sep 1; 75 (9): e14484.

ObjectiveAutoimmune thyroid diseases, including Hashimoto's thyroiditis, are the most common ones among autoimmune diseases. The reported effects of selenium supplementation on the course of Hashimoto's thyroiditis are not consistent. It is therefore important to continue this line of research.DesignThe participants received selenium in the form of sodium selenite(IV) at a dose of 100 µg/day for 6 months.PatientsNewly diagnosed and previously untreated Hashimoto's thyroiditis with euthyroidism or subclinical hypothyroidism. A total of 36 patients (aged 20 to 52 years) qualified for this study, of whom 29 women were successfully enrolled and completed the intervention.MeasurementsBoth before and after supplementation the following parameters in serum were tested: anti-thyroid peroxidase antibodies, thyroid function indicators, selenium as well as antioxidant status parameters and other biochemical parameters (lipid profile, glucose). Iodine supply and subjective assessment of physical and psychological health were also monitored.ResultsSelenium supplementation decreased significantly level of anti-thyroid peroxidase antibodies what might have had a stabilizing effect on thyroid function, as values of thyroid parameters were within normal range before and at the end of the study. Mean level of selenium among patients was not different to healthy people in Poland. Median of ioduria was within normal range.ConclusionsThe study shows a potential way of protective effect of selenium in limiting development of overt hypothyroidism. The increase in the concentrations of Se and SELENOP in the serum of patients verifies successful supplementation and good compliance, but did not affect the antioxidant status parameters measured.© 2021 John Wiley & Sons Ltd.

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