RoC Skincare is testing its patented clinical retinol in adult female identical twins, combining clinical skin measurements with lifestyle biometrics collected by Oura Rings. The company says the pilot study was designed to establish whether twins offer a more precise way to study visible skin aging, and that the model produced a clear yes.
Why identical twins
Because identical twins share DNA and much of their early environment, differences in how their skin ages are harder to attribute to genetics. Art Pellegrino, RoC’s chief scientific officer, said that starting from the same genetic blueprint makes it easier to see what the retinol is doing on the skin. He described identical twins as close to a natural control: if their skin ages differently, lifestyle and environment become the more likely explanation.
The pilot was not intended to quantify how much skin aging comes from genes versus daily life. That question is the focus of the expanded study, which will examine how factors such as sleep and stress change the picture when genetics are held constant.
Pilot signals and limits
According to Pellegrino, twins in the placebo group had similar or worse signs of aging at the end of the pilot. Twins in the treatment group showed as much as, or more than, 20% improvement in four weeks. Those are pilot observations, not proof that retinol caused a specific long-term anti-aging outcome; the company is now moving to a larger phase.
RoC is recruiting 30 pairs of adult female identical twins aged 40 and older who live in the United States. Participants will use the regimen for 12 weeks. Pellegrino said the focused group is intended to produce cleaner data and represents one stage in a longer research program on “skin span,” or how long skin keeps looking its best.
Wearables alongside clinical measures
Throughout the study, twins will wear an Oura Ring, a wearable device that tracks health and wellness metrics. RoC plans to capture variations in sleep, stress, heart rate, heart rate variability and temperature trends. Pellegrino said wearables are opening an opportunity to factor in how people live when recommending skin care.
The company cannot ensure that twins have identical external influences, such as sun exposure or diet. It is therefore recruiting twins with similar levels of environmental damage where possible and tracking sleep and stress closely during the study. With genetics held constant and lifestyle tracked, RoC hopes to examine how stressors relate to changes in each participant’s skin.
That comparison could show whether weeks of poor sleep line up with lower hydration readings, or whether the twin with lower stress sees fine lines improve faster. RoC is also interested in the reverse question: whether participants who see visible skin improvements feel less stressed. These are research questions, not reported outcomes.
Clinical assessments include expert grading, digital photography, corneometer readings and participant self-assessment. Together with the wearable data, RoC expects to quantify external stressors and their impact on skin condition.
What comes next
RoC expects results from the twin study by mid-2027. Pellegrino said the findings will shape how the company develops products for skin longevity and how it designs clinical studies going forward. For now, the project is best understood as a methods test with an early signal: a twin-based model that combines biometric lifestyle tracking with established skin measures, and a larger study still underway.