Effect of Retinol on Skin Smoothness

A randomized, double-blind, split-face study comparing the efficacy and tolerability of three retinol-based products vs. three tretinoin-based products in subjects with moderate to severe facial photodamage (2015)

Retinyl retinoate, a novel hybrid vitamin derivative, improves photoaged skin: a double-blind, randomized-controlled trial (2011)

Improvement of naturally aged skin with vitamin A (retinol) (2007)