RoC Skincare is testing its Patented Clinical Retinol on adult female identical twins, pairing clinical skin measurements with lifestyle biometrics gathered by Oura Rings. The company frames the work as a pilot study built to validate the twin model before a larger trial.
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, chief scientific officer at RoC Skincare, said that when two people start from the same genetic blueprint, it becomes far easier to see what the retinol is actually doing on the skin.
What the pilot showed
According to Pellegrino, twins in the placebo group displayed similar or worse signs of aging by the end of the pilot, while twins in the treatment group improved by 20% or more within four weeks. He said the pilot's aim was to prove the model rather than to measure how much skin aging comes from genes versus lifestyle, a question left to the expanded study. Asked whether identical twins could offer a more precise way to study what drives visible skin aging, he said the answer was yes.
Next phase: 30 pairs over 12 weeks
RoC is recruiting 30 pairs of adult female identical twins aged 40 and older living in the US, who will follow the regimen for 12 weeks. Pellegrino said a focused group gives cleaner data to build on, and the company positions this stage within a longer research program on extending "skin span" — how long skin keeps looking its best.
Wearables as a lifestyle control
Throughout the study, twins are asked to wear an Oura Ring, which tracks health and wellness metrics including sleep, stress, heart rate, heart rate variability and temperature trends. Pellegrino said wearables are opening an opportunity across the industry to factor in how people live when recommending skin care.
Because external influences such as sun exposure or diet cannot be held identical, RoC is recruiting twins with similar levels of environmental damage wherever possible and monitoring sleep and stress closely. With genetics taken out of the question, the brand expects to relate stressors to changes in each participant's skin — for instance, whether weeks of poor sleep line up with lower hydration readings, or whether the twin under less stress sees fine lines improve faster. RoC is also looking in the other direction, exploring whether participants who see visible improvements feel less stressed as a result.
Measurement and timeline
RoC's standard clinical skin measures assess signs of aging through expert grading, digital photography, corneometer readings and subject self-assessment. Pellegrino said the findings will shape how the company develops products for skin longevity and designs its clinical studies going forward. RoC expects results from the twin study by mid-2027.