Impact of additional cholecalciferol supplementation on the level of thyroid peroxidase antibodies in patients with primary hypothyroidism

Background. The results of current numerous scientific researches testify to many-sided influence of vitamin D on different organs and systems of human organism. Purpose of the study — to study the effects of the additional cholecalciferol supplementation on the indexes of thyroid peroxidase (TPO) antibodies in patients with autoimmune hypothyroidism. Materials and methods. There were 65 patients with primary hypothyroidism aged 27–59 years, randomized into 2 groups. Cholecalciferol was additionally prescribed to the patients of the first group (n = 36) in a dose of 4000 IU/day (28000 IU/week) during three months on a background of levothyroxine therapy. The patients of the second group (n = 29) received only levothyroxine therapy. Results. Among inspected patients with hypothyroidism, 61 (93.9 %) had deficiency and insufficiency of vitamin D. As for patients with hypothyroidism, a significant negative correlation was detected between the levels of 25(ОН)D and TPO antibodies (r = –0.17; р = 0.046). The additional administration of vitamin of D results in a significant decline in the level of TPO antibodies (–46.7 %) in patients with hypothyroidism. On the whole, a decrease in TPO antibody level by 25 % or more was achieved in 80.6 % of patients. Conclusions. Use of vitamin of D resulted in a significant increase of 25(OH)D content in the blood serum with the corresponding reduction of parathyroid hormone concentration, decrease of thyroid peroxidase antibodies level.