Objectives: The aim of this study was to evaluate the quality of abstracts of randomized controlled trials on using collagen. Materials and methods: The research has studied the quality of abstracts of randomized controlled clinical trials using oral collagen and its impact on the skin. Abstracts were searched in the MEDLINE database using the PubMed search engine with the keywords "collagen" and "skin" as well as the filter "randomized controlled trial". The abstracts were then analyzed for the presence of CONSORT guidelines items for abstracts. The program for analyzing and interpreting the results was MedCalc. Results: The search resulted in 212 scientific trials with these filters, but a large number were excluded from further processing, as many as 178 of them because they did not fit the appropriate criteria. The study was conducted on a small number of papers, i.e. 34 of them. Differences in the presence of items in non-structured and structured abstracts have been demonstrated. The items with the highest appearance among the articles are intervention, goal and recruitment, while those with the least are randomization, registration and funding. Conclusion: Abstracts of scientific research on using collagen and its effect on the skin are of low quality according to the criteria of the CONSORT list. Thus, a lack of transparency and credibility of abstract readers is achieved, but also leaves room for progress in better monitoring of guidelines.