Illia Koval, Wiktor Kubik, Bartłomiej Czarnecki, Jan Nowak, Bartosz Zwoliński, Kacper Sukiennicki, Wirginia Bertman, Natalia Kołdej, Zuzanna Kępczyńska, Katarzyna Szewczyk, Kamil Borysewicz, Klaudia Romejko, & Barbara Kujawa. (2025). VITAMIN D3 DEFICIENCY AND THE EFFECTIVENESS OF SUBLINGUAL SUPPLEMENTATION – A REVIEW OF CLINICAL STUDIES. International Journal of Innovative Technologies in Social Science, 2(4(48). https://doi.org/10.31435/ijitss.4(48).2025.4215