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. 2023 Apr 26;15(9):2080. doi: 10.3390/nu15092080

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© 2023 by the authors.

Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (https://creativecommons.org/licenses/by/4.0/).

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Forest plot of the included studies evaluating skin elasticity in patients supplemented with HC and patients in the placebo group [26,27,28,29,31,32,33,34,35,37,39,40,41,42,43,44,47,48,49]. (HC: hydrolyzed collagen, CI: confidence intervals, SD: standard deviation, I²: heterogeneity).