RoC Skincare is testing its patented clinical retinol on adult female identical twins, pairing standard clinical skin measurements with lifestyle biometric data collected by Oura Rings. The brand has completed a pilot phase and is now recruiting 30 pairs of identical twins aged 40 and older living in the US for a 12-week expanded study, with results expected by mid-2027.
Twins as a natural control
Art Pellegrino, chief scientific officer at RoC Skincare, says the pilot was designed to establish whether identical twins could offer a more precise way to study what drives visible skin aging, and that the company concluded they could. Because identical twins share DNA and much of their early environment, differences between them are harder to attribute to genetics, making lifestyle or product use the more likely explanation, he says.
Pellegrino describes identical twins as about as close as research gets to a natural control: when their skin ages differently, environment and habits become the likelier cause.
What the pilot found
According to the company, twins in the placebo group showed similar or worse signs of aging by the end of the pilot, while twins in the treatment group saw improvements of 20% or more within four weeks. Those are RoC's own reported findings from a small pilot, not independently verified results, and the pilot was not set up to quantify how much of skin aging stems from genes versus daily life.
That question is the focus of the expanded phase, which the brand says will examine how factors such as sleep and stress shift the picture when genetics are held constant.
Wearables in the routine
Participants are asked to wear an Oura Ring throughout the study. The device records health and wellness metrics including sleep, stress, heart rate, heart rate variability and temperature trends. Pellegrino says wearables are opening an opportunity across the industry to factor in how people actually live when recommending skin care.
Since external influences such as sun exposure or diet cannot be guaranteed to match, RoC is recruiting twins with similar levels of environmental damage wherever possible and tracking sleep and stress closely during the study. The setup is intended to let researchers compare sisters over time, for example checking whether stretches of poor sleep line up with lower hydration readings, or whether the twin reporting less stress sees fine lines improve faster.
Measures and aims
Skin changes are assessed through RoC's standard clinical methods: expert grading, digital photography, corneometer readings and participant self-assessment. The brand is also interested in the reverse relationship — whether participants who see visible improvement report feeling less stressed.
Pellegrino says the study is one stage in a longer research program on what RoC calls skin span, or how long skin keeps looking its best. Findings are expected to shape how the company develops products for skin longevity and how it designs future clinical studies. The expanded work remains limited to a focused group of US women aged 40 and over, which the brand says is intended to produce cleaner data to build on.