Collagen supplements can improve skin elasticity and hydration when taken consistently over time, but they do not stop wrinkles, according to a major new scientific review that assessed the strongest evidence to date on the trendy supplement. Researchers say the products offer “legitimate” skin benefits yet should not be marketed as a quick fix for aging. The findings come from an umbrella review led by researchers at Anglia Ruskin University (ARU) in England, which analyzed evidence from 16