Kozik, Wiktoria, Dagmara Polak-Bielawska, Aleksandra Kutaj, and Tatyana Savitskaya. “Collagen As a Bioactive Ingredient in Nutricosmetology - A Review”. Quality in Sport 46 (November 20, 2025): 66618. Accessed December 13, 2025. https://apcz.umk.pl/QS/article/view/66618.