RoC Skincare is testing its Patented Clinical Retinol on pairs of adult female identical twins, pairing clinical skin measurements with lifestyle biometric data collected by Oura Rings. The company frames the work as a pilot study built to establish whether twins can serve as a more precise model for studying what drives visible skin aging.
Art Pellegrino, the brand's chief scientific officer, said the pilot was intended to prove the model — to find out whether identical twins could support a more precise way of studying visible skin aging — and that the answer was yes.
Because identical twins share DNA and much of their early environment, researchers can more confidently attribute differences in skin aging to lifestyle factors or to products. Pellegrino described identical twins as about as close as researchers get to a natural control: if their skin ages differently, lifestyle and environment become the likelier explanation.
How the study is designed
Participants wear an Oura Ring, a wearable device that tracks health and wellness metrics through the day, capturing variation in biometric data including sleep, stress, heart rate, heart rate variability and temperature trends. Those readings sit alongside RoC's standard clinical skin measures: expert grading, digital photography, corneometer readings and participant self-assessment.
RoC notes that it cannot guarantee identical external influences such as sun exposure or diet, so it is recruiting twins with similar levels of environmental damage where possible and following sleep and stress closely throughout the study.
According to Pellegrino, combining lifestyle tracking with the genetic control that twins provide lets RoC examine how stressors relate to changes in each participant's skin. If one twin sleeps poorly or is under more stress, the team can assess whether her skin responds differently to the regimen than her sister's — for example, whether stretches of poor sleep line up with lower hydration readings, or whether the twin with lower stress sees fine lines improve faster. The brand is also interested in the reverse question: whether participants who see visible skin improvements also feel less stressed.
Pilot results and the expanded phase
In the pilot, Pellegrino said twins in the placebo group had similar or worse signs of aging at the end of the study, while twins in the treatment group showed as much as, or more than, 20% improvement within four weeks. He added that the pilot did not try to measure how much skin aging stems from genes versus lifestyle; that is the purpose of the expanded study, which aims to show how daily life factors such as sleep and stress shift the picture when genetics is held constant.
RoC is recruiting 30 pairs of adult female identical twins aged 40 and older living in the United States for the next phase, in which participants will use the regimen for 12 weeks. Pellegrino said the deliberately focused group should yield cleaner data to build on, and that RoC treats the study as one stage in a longer research program on skin span — how long skin keeps looking its best.
He said wearables are opening an opportunity across the industry to factor in how people live when recommending skin care, and that demonstrating how habits such as sleep and stress affect the skin can sharpen the brand's ability to offer effective anti-aging products. RoC expects results from the twin study by mid-2027, and Pellegrino said what the company learns will shape how it develops products for skin longevity and how it designs clinical studies going forward.