• Przewłócka K, Kujach S, Sawicki P, Berezka P, Bytowska ZK, Folwarski M, Kowalski K, Kaczor JJ. Effects of Probiotics and Vitamin D₃Supplementation on Sports Performance Markers in Male Mixed Martial Arts Athletes: A Randomized Trial. Sports Med Open. 2023 May 16;9(1):31. doi: 10.1186/s40798-023-00576-6. PMID: 37193828; PMCID: PMC10188824.