Yes, Dr Harris and a team of clinical colleagues put his Anti-Wrinkle Sleep Mask through a randomised, placebo-controlled clinical trial in 2016. The trial found that the mask genuinely and significantly reduced the look of vertical frown lines on the forehead, and also that it created a genuine emotional relaxation. The trial was published in the aesthetic-industry peer-reviewed journal Prime, and won an award from the British College of Aesthetic Medicine for the rigorous way in which it was conducted.