Is Collagen worth prioritizing?

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. Weighing that against the numbers, Collagen is not a priority based on current data — the evidence is only moderate (50/100), and its estimated impact (32/100) is on the lower end too.