RoC Skincare is moving a twin-based retinol study into a larger phase after a pilot suggested that identical twins can provide a tighter comparison for visible skin aging. The company is working to recruit 30 pairs of adult female identical twins, aged 40 and older and living in the United States, to test its Patented Clinical Retinol over 12 weeks.
The design combines clinical skin measures with lifestyle biometrics collected by Oura Ring. According to RoC, the wearable tracks sleep, stress, heart rate, heart rate variability and temperature trends. Those readings are intended to sit alongside expert grading, digital photography, corneometer readings and participants' own assessments.
Why identical twins
Art Pellegrino, RoC Skincare's chief scientific officer, said the appeal of identical twins is that they begin with the same genetic blueprint and much of the same early environment. When their skin ages differently, lifestyle and environment become more plausible explanations. That, he said, makes it easier to see what the retinol regimen is doing on the skin.
Pellegrino described the pilot as a test of the model itself: whether identical twins could offer a more precise way to study what drives visible skin aging. According to RoC, the pilot indicated that they can. In the pilot, twins in the placebo group showed similar or worse signs of aging at the end, while those in the treatment group showed 20% or more improvement in just four weeks.
The pilot did not attempt to quantify how much skin aging stems from genes versus lifestyle. The expanded study is meant to examine that balance. By holding genetics constant, RoC hopes to see how daily life, including sleep and stress, changes the picture.
Wearables and limits
RoC acknowledges that twins may not share every external influence. Sun exposure, diet and other environmental factors can differ, so the brand is recruiting pairs with similar levels of environmental damage where possible and tracking lifestyle factors throughout the study.
Pellegrino said the combination of identical genetics and wearable tracking could allow researchers to compare how each twin's skin responds to the regimen. If one sister sleeps poorly or reports more stress, the study may show whether her skin behaves differently from her twin's. The study is designed to examine whether weeks of poor sleep line up with lower hydration readings, or whether the twin with lower stress sees fine lines improve faster.
The company is also interested in the reverse relationship: whether participants who see visible skin improvements feel less stressed. Pellegrino said wearables are opening an opportunity across the industry to factor in how people live when recommending skin care.
RoC positions the 12-week twin study as one stage in a longer research program on skin span, or how long skin keeps looking its best. Findings are expected to shape how the brand develops products for skin longevity and designs future clinical studies. RoC expects results from the twin study by mid-2027.