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Forest plot for the subgroup analysis of skin hydration expressed as 2, 4, 6, 8, and 12 weeks in patients supplemented with HC and patients in the placebo group [26,27,28,29,30,31,32,33,34,35,39,40,43,44,46,47,48,49,50]. (HC: hydrolyzed collagen, CI: confidence intervals, SD: standard deviation, I2: heterogeneity).
