Histological Evaluation of a Topically Applied Retinol-Vitamin C Combination
This 2005 study conducted two double-blind, vehicle-controlled trials to assess the histological effects of a topical formulation combining retinol and vitamin C on aged and photoaged human skin. In the first study, eight postmenopausal women applied the formulation to one elbow and a vehicle to the other twice daily for
June 26, 2025
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