Whether collagen “works” depends on the goal. In the scientific literature, hydrolyzed collagen peptides have shown measurable improvements in skin hydration and elasticity in randomized controlled trials. For joints, Type 2 collagen—especially UC-II—has been associated with reduced pain and stiffness in some studies. However, outcomes vary by individual and can feel like “no effect” if expectations are unrealistic. Collagen does not compensate for UV damage, high sugar intake, or smoking. The most accurate positioning is that collagen is a supportive tool when matched to the right type and used consistently; it does not replace lifestyle fundamentals. An evidence-based approach integrates collagen into a broader system rather than treating it as a standalone fix.