VDR and Hashimoto thyroiditis: The aim of this study is: (1) to investigate the influence of vitamin D receptors density in patients with Hashimoto’s thyroiditis, (2) to examine the relationship between vitamin D levels and the incidence of various diseases, with a particular emphasis on Hashimoto’s thyroiditis, and (3) to discuss how vitamin D affects the immune system in the context of Hashimoto’s thyroiditis.