TG and thyroid gland disorder: After exclusion of subjects with S-TPOab positivity (n = 45), the geometric mean DBS-Tg was still lower (p = 0.002) in supplement users than in non-supplement users (data not shown).The concentration of thyroid function parameters (DBS-TSH, DBS-tT4, and S-TPOabs) and the prevalence of subclinical and clinical thyroid disorders after exclusion of subjects treated with levothyroxine (n = 66) are presented in Table 3.