The Short Version
Multiple systematic reviews and meta-analyses — including an umbrella review of 113 trials and nearly 8,000 participants — consistently find that oral collagen supplementation produces statistically significant improvements in skin elasticity. However, the effects are generally modest, build over weeks, and vary by product type, dose, and study quality. Some analyses report that positive results shrink or disappear when restricted to higher-quality, independently funded trials, meaning the unqualified claim overstates the reliability and magnitude of the benefit.