Cąkała, Marlena, Aleksandra Zajkowska, Magdalena Kozioł, Kamila Podgórniak, Karolina Błaszczak, Joanna Skotnicka, and Maria Witkowska. “The Overview of Available Vitamin and Supplement Products Used to Improve Immune System Function”. Quality in Sport 19 (July 28, 2024): 53221. Accessed October 11, 2024. https://apcz.umk.pl/QS/article/view/53221.