Moreover, there is data on the association between low vitamin D levels and the thyroid autoantibody titre in patients with Graves’ disease as well as the association of polymorphisms in the vitamin D receptor (VDR) gene in patients with GD (Unal et al., 2014; Zhang et al., 2015; Veneti et al., 2019; Płazińska et al., 2020). The gene discussed is VDR; the disease is Graves disease.