How many studies support Collagen?

Multiple independent meta-analyses of randomized trials find oral hydrolyzed collagen supplementation improves skin hydration and elasticity and reduces signs of skin aging, a reasonably consistent finding across several independent research groups. That's backed by 10 published studies in Vitaebase's database, including 2 randomized controlled trials and 5 meta-analyses, the most recent from 2025 -- a fairly substantial body of research for a single topic.