Illustration courtesy Juliet M. Pullar et al. J Invest Dermatol 2025 Oct. 29:S0022-202X(25)03509-2 A new study from the University of Otago in Christchurch, New Zealand, has found that dietary vitamin C intake directly enhances collagen production and skin renewal, offering clinical confirmation that nutrition may play a central role in skin physiology. Published in the Journal of Investigative Dermatology , the investigation established a strong, dose-responsive relationship