Unal et al., demonstrated that 254 newly diagnosed HT and 27 GD patients had lower 25(OH)D levels than 124 healthy controls (p < 0.001), and serum 25(OH)D levels were inversely correlated with anti-Tg (r = −0.136; p = 0.025) and anti-TPO (r = −0.176; p = 0.003) antibodies [26]. Here, TG is linked to hematocrit.