KOZIK, Wiktoria, POLAK-BIELAWSKA, Dagmara, KUTAJ, Aleksandra and SAVITSKAYA, Tatyana. Collagen as a Bioactive Ingredient in Nutricosmetology - A Review. Quality in Sport. Online. 20 November 2025. Vol. 46, p. 66618. [Accessed 13 December 2025]. DOI 10.12775/QS.2025.46.66618.